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FBF filter-based forwarding dual ISP failover

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  • 1.  FBF filter-based forwarding dual ISP failover

    Posted 03-12-2020 17:37

    I'm trying to configure a trust interface to failover from one ISP on ge-0/0/0 to another on ge-0/0/1, but my trust int only seems to route to one. I am following juniper kb solution here . Here's what I have so far:

    interfaces {
        ge-0/0/0 {
            unit 0 {
                description isp1;
                family inet {
                    address 1.1.1.2/24;
                }
            }
        }
        ge-0/0/1 {
            unit 0 {
                description isp2;
                family inet {
                    address 2.2.2.2/24;
                }
            }
        }
        ge-0/0/2 {
            unit 0 {
                description pos;
                family inet {
                    filter {
                        input F1;
                    }
                    address 192.168.8.1/24;
                }
            }
        }
        ge-0/0/3 {
            unit 0 {
                description office;
                family inet {
                    address 192.168.20.1/24;
                }
            }
        }
        ge-0/0/4 {
            unit 0 {
                description publicwifi;
                family inet {
                    address 172.16.30.1/24;
                }
            }
        }
    }
    routing-options {
        interface-routes {
            rib-group inet IMPORT-PHY;
        }
        static {
            route 0.0.0.0/0 next-hop 1.1.1.1;
        }
        rib-groups {
            IMPORT-PHY {
                import-rib [ inet.0 FBF-1.inet.0 FBF-2.inet.0 ];
            }
        }
    }
    security {
        nat {
            source {
                rule-set interface-nat {
                    from zone office;
                    to zone untrustisp1;
                    rule rule1 {
                        match {
                            source-address 0.0.0.0/0;
                            destination-address 0.0.0.0/0;
                        }
                        then {
                            source-nat {
                                interface;
                            }
                        }
                    }
                }
                rule-set pos-nat {
                    from zone pos;
                    to zone untrustisp1;
                    rule rule0 {
                        match {
                            source-address 0.0.0.0/0;
                            destination-address 0.0.0.0/0;
                        }
                        then {
                            source-nat {
                                interface;
                            }
                        }
                    }
                }
                rule-set wifi-nat {
                    from zone publicwifi;
                    to zone untrustisp1;
                    rule rulewifi {
                        match {
                            source-address 0.0.0.0/0;
                            destination-address 0.0.0.0/0;
                        }
                        then {
                            source-nat {
                                interface;
                            }
                        }
                    }
                }
            }
        }
        policies {
            from-zone pos to-zone untrustisp1 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
            from-zone office to-zone untrustisp1 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
            from-zone publicwifi to-zone untrustisp1 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
            from-zone pos to-zone untrustisp2 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
            from-zone office to-zone untrustisp2 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
            from-zone publicwifi to-zone untrustisp2 {
                policy policy-name {
                    match {
                        source-address any;
                        destination-address any;
                        application any;
                    }
                    then {
                        permit;
                    }
                }
            }
        }
        zones {
            security-zone untrustisp1 {
                interfaces {
                    ge-0/0/0.0 {
                        host-inbound-traffic {
                            system-services {
                                ping;
                            }
                        }
                    }
                }
            }
            security-zone untrustisp2 {
                interfaces {
                    ge-0/0/1.0 {
                        host-inbound-traffic {
                            system-services {
                                ping;
                            }
                        }
                    }
                }
            }
            security-zone pos {
                interfaces {
                    ge-0/0/2.0 {
                        host-inbound-traffic {
                            system-services {
                                dhcp;
                                ping;
                                http;
                                https;
                            }
                        }
                    }
                }
            }
            security-zone office {
                interfaces {
                    ge-0/0/3.0 {
                        host-inbound-traffic {
                            system-services {
                                dhcp;
                                ping;
                                rpm;
                            }
                        }
                    }
                }
            }
            security-zone publicwifi {
                interfaces {
                    ge-0/0/4.0 {
                        host-inbound-traffic {
                            system-services {
                                dhcp;
                                ping;
                            }
                        }
                    }
                }
            }
        }
    }
    firewall {
        filter F1 {
            term 1 {
                from {
                    source-address {
                        192.168.8.100/32;
                    }
                }
                then {
                    routing-instance FBF-2;
                }
            }
            term 2 {
                from {
                    source-address {
                        0.0.0.0/0;
                    }
                }
                then {
                    routing-instance FBF-1;
                }
            }
        }
    }
    routing-instances {
        FBF-1 {
            instance-type forwarding;
            routing-options {
                static {
                    route 0.0.0.0/0 next-hop 1.1.1.1;
                }
            }
        }
        FBF-2 {
            instance-type forwarding;
            routing-options {
                static {
                    route 0.0.0.0/0 next-hop 2.2.2.1;
                }
            }
        }
    }
    services {
        rpm {
            probe Probe-Server {
                test testsvr {
                    target address 1.1.1.1;
                    probe-count 10;
                    probe-interval 5;
                    test-interval 10;
                    thresholds {
                        successive-loss 10;
                        total-loss 5;
                    }
                    destination-interface ge-0/0/0.0;
                    next-hop 1.1.1.1;
                }
            }
            probe Probe-Server1 {
                test testsvr {
                    target address 2.2.2.1;
                    probe-count 10;
                    probe-interval 5;
                    test-interval 10;
                    thresholds {
                        successive-loss 10;
                        total-loss 5;
                    }
                    destination-interface ge-0/0/1.0;
                    next-hop 2.2.2.1;
                }
            }
        }
        ip-monitoring {
            policy Server-Tracking {
                match {
                    rpm-probe Probe-Server;
                }
                then {
                    preferred-route {
                        routing-instances FBF-1 {
                            route 0.0.0.0/0 {
                                next-hop 1.1.1.1;
                            }
                        }
                    }
                }
            }
            policy Server-Tracking1 {
                match {
                    rpm-probe Probe-Server1;
                }
                then {
                    preferred-route {
                        routing-instances FBF-2 {
                            route 0.0.0.0/0 {
                                next-hop 2.2.2.1;
                            }
                        }
                    }
                }
            }
        }
    }

    I don't quite understand what firewall filter F1 and RPM configuration is really trying to do.

     

    Should I be using ECMP for this instead, or something else?


    #loadbalance
    #fbf


  • 2.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-12-2020 23:44

    Hi silverst8p,

     

    Greetings, This is expected because you have a failover mechanism which means that only if one link fails the other one takes part of the action.. Now if you are looking for some load balancing ECMP is the way to go, let me clarify each question for you:

     

    F1 in your case is a regular firewall filter that is necessary to do an FBF ( filter-based forwarding) once the intended traffic hits the filter it will redirect it to the routing instance that is configured. 

     

     

    RPM
    The real-time performance monitoring (RPM) feature allows you to accurately measure the performance between two network endpoints. With the RPM tool, you configure and send probes to a specified target and monitor the analyzed results to determine packet loss, round-trip time, and jitter, In your case it means that if one the probe fails and it is currently the active path it will do the failover to the other one that succeed the probe. If the probe from the active path succeeds there is not failover.

     

    Regarding your question about ECMP, this is completely different than a failover mechanism as mentioned above, ECMP stand for equal-cost multipath and this is to load balance traffic across multiple paths when the cost to reach to their destination is the same ( equal)

     

    Now take into consideration that if you have multiple next hops to the same destination if one fails the other one will take over so, in essence, it is a failover as well.

     

    To summarize:

     

    F1 is a firewall filter that classifies traffic into a routing instance.

     

    RPM is to check your network performance and reachability then based on the results, an action can be taken.

     

    ECMP Is formed when the routing table contains multiple next-hop addresses for the same destination with an equal cost. (Routes of equal cost have the same preference and metric values.) If there is an ECMP set for the active route, Junos OS uses a hash algorithm to choose one of the next-hop addresses in the ECMP set to install in the forwarding table.

     

    Please check this doc about ECMP and how to go after it gentlemen! 

     

    https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ecmp-flow-based.html

     

    If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

     

    Regards,

    Lil Dexx
    JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB



  • 3.  RE: FBF filter-based forwarding dual ISP failover

    Posted 03-13-2020 09:18

    Thanks so much for this explanation @LilDexx 🙂

     

    The intended functionality is to prefer ISP1 over ISP2 for all traffic, but automatically failover all traffic to ISP2 in case ISP1 becomes unreachable, so I think FBF should work for that?

     

    Right now the traffic doesn't seem to be failing over to the backup ISP connection if I disconnect the the primary ISP link. I think the FBF *should* be doing that? Maybe I didn't leave it disconnected long enough for RPM to see the primary ISP down? I'll test some more.



  • 4.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-13-2020 13:07

    Hey silverst8p/all,

     

    You are more than welcome, I strongly believe that this should work because the default route is coming from inet.0 through the rib-group sharing and not from a dynamic protocol injected by the next-hop, which means that if the next-hop is not reachable the route will still be there furthermore when the next-hop is not reachable the ip-monitor policy should take place, for faster failover you can modify the RPM thresholds the way you desired e.i

     

    probe-count 5
    probe-interval 1
    test-interval 5
    total-loss 3

     

    Also, make sure if one of the probes is failing otherwise the failover would not happen e.i

    [edit]
    root@SRX-Firewall# run show services ip-monitoring status

    Policy - GR1 (Status: FAIL)
    RPM Probes:
    Probe name Test Name Address Status
    ---------------------- --------------- ---------------- ---------
    Failover1 probe-ge1 2.1.1.2 FAIL
    Route-Action:
    route-instance route next-hop state
    ----------------- ----------------- ---------------- -------------
    inet.0 0.0.0.0/0 2.1.1.6 APPLIED

     

    Here is a sample without RI's But the principle is the same: https://kb.juniper.net/InfoCenter/index?page=content&id=KB32556

     

    If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

    Regards,

    Lil Dexx
    JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB



  • 5.  RE: FBF filter-based forwarding dual ISP failover

    Posted 03-18-2020 17:36

    I tried disconnecting ISP1 on ge-0/0/0 and after a bit then got:

    show services rpm probe-results
        Owner: Probe-Server, Test: testsvr
        Target address: 1.1.1.1, Probe type: icmp-ping
        Destination interface name: ge-0/0/0.0
        Test size: 10 probes
        Probe results:
          Internal error, Thu Mar 19 07:49:45 2020
        Results over current test:
          Probes sent: 10, Probes received: 2, Loss percentage: 80
          Measurement: Round trip time
            Samples: 2, Minimum: 2644 usec, Maximum: 9208 usec, Average: 5926 usec,
            Peak to peak: 6564 usec, Stddev: 3282 usec, Sum: 11852 usec
        Results over last test:
          Probes sent: 10, Probes received: 2, Loss percentage: 80
          Test completed on Thu Mar 19 07:49:50 2020
          Measurement: Round trip time
            Samples: 2, Minimum: 2644 usec, Maximum: 9208 usec, Average: 5926 usec,
            Peak to peak: 6564 usec, Stddev: 3282 usec, Sum: 11852 usec
        Results over all tests:
          Probes sent: 1850, Probes received: 1841, Loss percentage: 0
          Measurement: Round trip time
            Samples: 1841, Minimum: 2485 usec, Maximum: 48585 usec,
            Average: 4015 usec, Peak to peak: 46100 usec, Stddev: 5453 usec,
            Sum: 7391625 usec
    
        Owner: Probe-Server1, Test: testsvr
        Target address: 2.2.2.1, Probe type: icmp-ping
        Destination interface name: ge-0/0/1.0
        Test size: 10 probes
        Probe results:
          Response received, Thu Mar 19 07:49:55 2020, No hardware timestamps
          Rtt: 2044 usec
        Results over current test:
          Probes sent: 1, Probes received: 1, Loss percentage: 0
          Measurement: Round trip time
            Samples: 1, Minimum: 2044 usec, Maximum: 2044 usec, Average: 2044 usec,
            Peak to peak: 0 usec, Stddev: 0 usec, Sum: 2044 usec
        Results over last test:
          Probes sent: 10, Probes received: 10, Loss percentage: 0
          Test completed on Thu Mar 19 07:49:45 2020
          Measurement: Round trip time
            Samples: 10, Minimum: 1845 usec, Maximum: 1969 usec, Average: 1928 usec,
            Peak to peak: 124 usec, Stddev: 34 usec, Sum: 19275 usec
        Results over all tests:
          Probes sent: 1851, Probes received: 1851, Loss percentage: 0
          Measurement: Round trip time
            Samples: 1851, Minimum: 1756 usec, Maximum: 3600661 usec,
            Average: 4064 usec, Peak to peak: 3598905 usec, Stddev: 83622 usec,
            Sum: 7521863 usec

    and

    show services ip-monitoring status
    
    Policy - Server-Tracking (Status: FAIL)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server           testsvr        1.1.1.1     FAIL
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-1             0.0.0.0/0         2.2.2.1     APPLIED
    
    Policy - Server-Tracking1 (Status: PASS)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server1          testsvr         2.2.2.1     PASS
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-2             0.0.0.0/0         1.1.1.1    NOT-APPLIED

    So it looks like RPM is detecting a failure, but I still can't ping the upstream gateway, it seems like my routing instances are either wrong or the wrong one is getting inserted? I'm still trying to get my head around what mistakes I may have made here:

    firewall {
        filter F1 {
            term 1 {
                from {
                    source-address {
                        192.168.8.100/32;
                    }
                }
                then {
                    routing-instance FBF-2;
                }
            }
            term 2 {
                from {
                    source-address {
                        0.0.0.0/0;
                    }
                }
                then {
                    routing-instance FBF-1;
                }
            }
        }
    }
    routing-instances {
        FBF-1 {
            instance-type forwarding;
            routing-options {
                static {
                    route 0.0.0.0/0 next-hop 1.1.1.1;
                }
            }
        }
        FBF-2 {
            instance-type forwarding;
            routing-options {
                static {
                    route 0.0.0.0/0 next-hop 2.2.2.1;
                }
            }
        }
    }

    I think I'm mixing up something simple? Here are my routes:

    show route
    
    inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    1.1.1.2/32    *[Local/0] 03:10:18
                          Reject
    172.16.30.1/32     *[Local/0] 03:10:17
                          Reject
    192.168.8.0/24     *[Direct/0] 03:10:13
                        > via ge-0/0/2.0
    192.168.8.1/32     *[Local/0] 03:10:17
                          Local via ge-0/0/2.0
    2.2.2.0/24    *[Direct/0] 03:10:14
                        > via ge-0/0/1.0
    2.2.2.150/32  *[Local/0] 03:10:18
                          Local via ge-0/0/1.0
    192.168.20.1/32    *[Local/0] 03:10:17
                          Reject
    
    FBF-1.inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    0.0.0.0/0          *[Static/1] 00:09:48, metric2 0
                        > to 192.168.13.1 via ge-0/0/1.0
    1.1.1.2/32    *[Local/0] 00:21:22
                          Reject
    172.16.30.1/32     *[Local/0] 03:10:17
                          Reject
    192.168.8.0/24     *[Direct/0] 03:10:13
                        > via ge-0/0/2.0
    192.168.8.1/32     *[Local/0] 03:10:13
                          Local via ge-0/0/2.0
    2.2.2.0/24    *[Direct/0] 03:10:14
                        > via ge-0/0/1.0
    2.2.2.150/32  *[Local/0] 03:10:14
                          Local via ge-0/0/1.0
    192.168.20.1/32    *[Local/0] 03:10:17
                          Reject
    
    FBF-2.inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    0.0.0.0/0          *[Static/5] 03:10:14
                        > to 192.168.13.1 via ge-0/0/1.0
    1.1.1.2/32    *[Local/0] 00:21:22
                          Reject
    172.16.30.1/32     *[Local/0] 03:10:17
                          Reject
    192.168.8.0/24     *[Direct/0] 03:10:13
                        > via ge-0/0/2.0
    192.168.8.1/32     *[Local/0] 03:10:13
                          Local via ge-0/0/2.0
    2.2.2.0/24    *[Direct/0] 03:10:14
                        > via ge-0/0/1.0
    2.2.2.150/32  *[Local/0] 03:10:14
                          Local via ge-0/0/1.0
    192.168.20.1/32    *[Local/0] 03:10:17
                          Reject


  • 6.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-25-2020 22:42

    The “show route” you shared is from when the ISP 1 was disconnected? I don’t see the default-route getting applied:

     

    FBF-2.inet.0: 8 destinations, 8 routes (8 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    0.0.0.0/0          *[Static/5] 03:10:14
                        > to 192.168.13.1 via ge-0/0/1.0
    

     



  • 7.  RE: FBF filter-based forwarding dual ISP failover
    Best Answer

    Posted 07-09-2020 15:05

    Okay, I FINALLY got this (seemingly simple) thing working after a very long time of working on it, I hope this helps someone.

     

    I still don't know how to set the preference for ISP1 vs ISP2, anyone know? RPM maybe?

     

    Anyway, if you have a Juniper SRX and you want to connect ISP1 to ge-0/0/0 and ISP2 to ge-0/0/1 and have your LAN traffic failover automatically, this is how you do it.

     

    I have three LAN zones, one for point-of-sale machines (pos), one for general office use, and one for public wifi that doesn't touch the other two. This would be typical for a small office probably. This config is barebones and not guaranteed to do anything in particular, but it does work.

     

    Let me know if you see anything I should fix. I think I don't need the

    set firewall filter F2 term 1 from source-address 192.168.20.100/32

    line, for example. Anyway, here it is:

    set version 12.1X46-D40.2
    set system host-name router
    set system root-authentication encrypted-password ""
    set system services dhcp pool 192.168.8.0/24 address-range low 192.168.8.150
    set system services dhcp pool 192.168.8.0/24 address-range high 192.168.8.254
    set system services dhcp pool 192.168.8.0/24 name-server 1.1.1.1
    set system services dhcp pool 192.168.8.0/24 router 192.168.8.1
    set system services dhcp pool 192.168.20.0/24 address-range low 192.168.20.150
    set system services dhcp pool 192.168.20.0/24 address-range high 192.168.20.254
    set system services dhcp pool 192.168.20.0/24 name-server 1.1.1.1
    set system services dhcp pool 192.168.20.0/24 router 192.168.20.1
    set system services dhcp pool 172.16.30.0/24 address-range low 172.16.30.150
    set system services dhcp pool 172.16.30.0/24 address-range high 172.16.30.254
    set system services dhcp pool 172.16.30.0/24 name-server 1.1.1.1
    set system services dhcp pool 172.16.30.0/24 router 172.16.30.1
    set interfaces ge-0/0/0 unit 0 description isp1
    set interfaces ge-0/0/0 unit 0 family inet address 1.2.3.29/29
    set interfaces ge-0/0/1 unit 0 description isp2
    set interfaces ge-0/0/1 unit 0 family inet address 5.6.7.8/24
    set interfaces ge-0/0/2 unit 0 description pos
    set interfaces ge-0/0/2 unit 0 family inet filter input F1
    set interfaces ge-0/0/2 unit 0 family inet address 192.168.8.1/24
    set interfaces ge-0/0/3 unit 0 description office
    set interfaces ge-0/0/3 unit 0 family inet filter input F2
    set interfaces ge-0/0/3 unit 0 family inet address 192.168.20.1/24
    set interfaces ge-0/0/4 unit 0 description publicwifi
    set interfaces ge-0/0/4 unit 0 family inet filter input F3
    set interfaces ge-0/0/4 unit 0 family inet address 172.16.30.1/24
    set routing-options interface-routes rib-group inet IMPORT-PHY
    set routing-options static route 0.0.0.0/0 next-hop 1.2.3.25
    set routing-options static route 0.0.0.0/0 next-hop 5.6.7.1
    set routing-options static route 0.0.0.0/0 metric 10
    set routing-options rib-groups IMPORT-PHY import-rib inet.0
    set routing-options rib-groups IMPORT-PHY import-rib FBF-1.inet.0
    set routing-options rib-groups IMPORT-PHY import-rib FBF-2.inet.0
    set security nat source rule-set interface-nat from zone office
    set security nat source rule-set interface-nat to zone untrustisp1
    set security nat source rule-set interface-nat rule rule1 match source-address 0.0.0.0/0
    set security nat source rule-set interface-nat rule rule1 match destination-address 0.0.0.0/0
    set security nat source rule-set interface-nat rule rule1 then source-nat interface
    set security nat source rule-set pos-nat from zone pos
    set security nat source rule-set pos-nat to zone untrustisp1
    set security nat source rule-set pos-nat rule rule0 match source-address 0.0.0.0/0
    set security nat source rule-set pos-nat rule rule0 match destination-address 0.0.0.0/0
    set security nat source rule-set pos-nat rule rule0 then source-nat interface
    set security nat source rule-set office-isp2-nat from zone office
    set security nat source rule-set office-isp2-nat to zone untrustisp2
    set security nat source rule-set office-isp2-nat rule isp2nat match source-address 0.0.0.0/0
    set security nat source rule-set office-isp2-nat rule isp2nat match destination-address 0.0.0.0/0
    set security nat source rule-set office-isp2-nat rule isp2nat then source-nat interface
    set security nat source rule-set pos-isp2-nat from zone pos
    set security nat source rule-set pos-isp2-nat to zone untrustisp2
    set security nat source rule-set pos-isp2-nat rule posisp2nat match source-address 0.0.0.0/0
    set security nat source rule-set pos-isp2-nat rule posisp2nat match destination-address 0.0.0.0/0
    set security nat source rule-set pos-isp2-nat rule posisp2nat then source-nat interface
    set security nat source rule-set wifi-nat-isp1 from zone publicwifi
    set security nat source rule-set wifi-nat-isp1 to zone untrustisp1
    set security nat source rule-set wifi-nat-isp1 rule wifi-nat-isp1 match source-address 0.0.0.0/0
    set security nat source rule-set wifi-nat-isp1 rule wifi-nat-isp1 match destination-address 0.0.0.0/0
    set security nat source rule-set wifi-nat-isp1 rule wifi-nat-isp1 then source-nat interface
    set security nat source rule-set wifi-nat-isp2 from zone publicwifi
    set security nat source rule-set wifi-nat-isp2 to zone untrustisp2
    set security nat source rule-set wifi-nat-isp2 rule wifi-nat-isp2 match source-address 0.0.0.0/0
    set security nat source rule-set wifi-nat-isp2 rule wifi-nat-isp2 match destination-address 0.0.0.0/0
    set security nat source rule-set wifi-nat-isp2 rule wifi-nat-isp2 then source-nat interface
    set security policies from-zone pos to-zone untrustisp1 policy policy-name match source-address any
    set security policies from-zone pos to-zone untrustisp1 policy policy-name match destination-address any
    set security policies from-zone pos to-zone untrustisp1 policy policy-name match application any
    set security policies from-zone pos to-zone untrustisp1 policy policy-name then permit
    set security policies from-zone office to-zone untrustisp1 policy policy-name match source-address any
    set security policies from-zone office to-zone untrustisp1 policy policy-name match destination-address any
    set security policies from-zone office to-zone untrustisp1 policy policy-name match application any
    set security policies from-zone office to-zone untrustisp1 policy policy-name then permit
    set security policies from-zone publicwifi to-zone untrustisp1 policy policy-name match source-address any
    set security policies from-zone publicwifi to-zone untrustisp1 policy policy-name match destination-address any
    set security policies from-zone publicwifi to-zone untrustisp1 policy policy-name match application any
    set security policies from-zone publicwifi to-zone untrustisp1 policy policy-name then permit
    set security policies from-zone pos to-zone untrustisp2 policy policy-name match source-address any
    set security policies from-zone pos to-zone untrustisp2 policy policy-name match destination-address any
    set security policies from-zone pos to-zone untrustisp2 policy policy-name match application any
    set security policies from-zone pos to-zone untrustisp2 policy policy-name then permit
    set security policies from-zone office to-zone untrustisp2 policy policy-name match source-address any
    set security policies from-zone office to-zone untrustisp2 policy policy-name match destination-address any
    set security policies from-zone office to-zone untrustisp2 policy policy-name match application any
    set security policies from-zone office to-zone untrustisp2 policy policy-name then permit
    set security policies from-zone publicwifi to-zone untrustisp2 policy policy-name match source-address any
    set security policies from-zone publicwifi to-zone untrustisp2 policy policy-name match destination-address any
    set security policies from-zone publicwifi to-zone untrustisp2 policy policy-name match application any
    set security policies from-zone publicwifi to-zone untrustisp2 policy policy-name then permit
    set security zones security-zone untrustisp1 interfaces ge-0/0/0.0 host-inbound-traffic system-services ping
    set security zones security-zone untrustisp2 interfaces ge-0/0/1.0 host-inbound-traffic system-services ping
    set security zones security-zone pos interfaces ge-0/0/2.0 host-inbound-traffic system-services dhcp
    set security zones security-zone pos interfaces ge-0/0/2.0 host-inbound-traffic system-services ping
    set security zones security-zone pos interfaces ge-0/0/2.0 host-inbound-traffic system-services http
    set security zones security-zone pos interfaces ge-0/0/2.0 host-inbound-traffic system-services https
    set security zones security-zone office interfaces ge-0/0/3.0 host-inbound-traffic system-services dhcp
    set security zones security-zone office interfaces ge-0/0/3.0 host-inbound-traffic system-services ping
    set security zones security-zone office interfaces ge-0/0/3.0 host-inbound-traffic system-services rpm
    set security zones security-zone publicwifi interfaces ge-0/0/4.0 host-inbound-traffic system-services dhcp
    set security zones security-zone publicwifi interfaces ge-0/0/4.0 host-inbound-traffic system-services ping
    set security zones security-zone publicwifi interfaces ge-0/0/4.0 host-inbound-traffic system-services rpm
    set firewall filter F1 term 1 from source-address 192.168.8.100/32
    set firewall filter F1 term 2 from source-address 0.0.0.0/0
    set firewall filter F2 term 1 from source-address 192.168.20.100/32
    set firewall filter F2 term 2 from source-address 0.0.0.0/0
    set firewall filter F3 term 1 from source-address 172.16.30.100/32
    set firewall filter F3 term 2 from source-address 0.0.0.0/0
    set services rpm probe Probe-Server test testsvr target address 1.2.3.25
    set services rpm probe Probe-Server test testsvr probe-count 10
    set services rpm probe Probe-Server test testsvr probe-interval 5
    set services rpm probe Probe-Server test testsvr test-interval 10
    set services rpm probe Probe-Server test testsvr thresholds successive-loss 10
    set services rpm probe Probe-Server test testsvr thresholds total-loss 5
    set services rpm probe Probe-Server test testsvr destination-interface ge-0/0/0.0
    set services rpm probe Probe-Server test testsvr next-hop 1.2.3.25
    set services rpm probe Probe-Server1 test testsvr target address 5.6.7.1
    set services rpm probe Probe-Server1 test testsvr probe-count 10
    set services rpm probe Probe-Server1 test testsvr probe-interval 5
    set services rpm probe Probe-Server1 test testsvr test-interval 10
    set services rpm probe Probe-Server1 test testsvr thresholds successive-loss 10
    set services rpm probe Probe-Server1 test testsvr thresholds total-loss 5
    set services rpm probe Probe-Server1 test testsvr destination-interface ge-0/0/1.0
    set services rpm probe Probe-Server1 test testsvr next-hop 5.6.7.1
    set services rpm probe Probe-pos test testpos target address 1.2.3.25
    set services rpm probe Probe-pos test testpos probe-count 10
    set services rpm probe Probe-pos test testpos probe-interval 5
    set services rpm probe Probe-pos test testpos test-interval 10
    set services rpm probe Probe-pos test testpos thresholds successive-loss 10
    set services rpm probe Probe-pos test testpos thresholds total-loss 5
    set services rpm probe Probe-pos test testpos destination-interface ge-0/0/0.0
    set services rpm probe Probe-pos test testpos next-hop 1.2.3.25
    set services rpm probe Probe-pos1 test testsvr target address 5.6.7.1
    set services rpm probe Probe-pos1 test testsvr probe-count 10
    set services rpm probe Probe-pos1 test testsvr probe-interval 5
    set services rpm probe Probe-pos1 test testsvr test-interval 10
    set services rpm probe Probe-pos1 test testsvr thresholds successive-loss 10
    set services rpm probe Probe-pos1 test testsvr thresholds total-loss 5
    set services rpm probe Probe-pos1 test testsvr destination-interface ge-0/0/1.0
    set services rpm probe Probe-pos1 test testsvr next-hop 5.6.7.1
    set services rpm probe Probe-wifi test testwifi target address 1.2.3.25
    set services rpm probe Probe-wifi test testwifi probe-count 10
    set services rpm probe Probe-wifi test testwifi probe-interval 5
    set services rpm probe Probe-wifi test testwifi test-interval 10
    set services rpm probe Probe-wifi test testwifi thresholds successive-loss 10
    set services rpm probe Probe-wifi test testwifi thresholds total-loss 5
    set services rpm probe Probe-wifi test testwifi destination-interface ge-0/0/0.0
    set services rpm probe Probe-wifi test testwifi next-hop 1.2.3.25
    set services rpm probe Probe-wifi1 test testsvr target address 5.6.7.1
    set services rpm probe Probe-wifi1 test testsvr probe-count 10
    set services rpm probe Probe-wifi1 test testsvr probe-interval 5
    set services rpm probe Probe-wifi1 test testsvr test-interval 10
    set services rpm probe Probe-wifi1 test testsvr thresholds successive-loss 10
    set services rpm probe Probe-wifi1 test testsvr thresholds total-loss 5
    set services rpm probe Probe-wifi1 test testsvr destination-interface ge-0/0/1.0
    set services rpm probe Probe-wifi1 test testsvr next-hop 5.6.7.1
    set services ip-monitoring policy Server-Tracking match rpm-probe Probe-Server
    set services ip-monitoring policy Server-Tracking then preferred-route route 0.0.0.0/0 next-hop 5.6.7.1
    set services ip-monitoring policy Server-Tracking1 match rpm-probe Probe-Server1
    set services ip-monitoring policy Server-Tracking1 then preferred-route route 0.0.0.0/0 next-hop 1.2.3.25
    set services ip-monitoring policy Server-trkpos match rpm-probe Probe-pos
    set services ip-monitoring policy Server-trkpos then preferred-route route 0.0.0.0/0 next-hop 5.6.7.1
    set services ip-monitoring policy Server-trkpos1 match rpm-probe Probe-pos1
    set services ip-monitoring policy Server-trkpos1 then preferred-route route 0.0.0.0/0 next-hop 1.2.3.2
    set services ip-monitoring policy Server-trkwifi match rpm-probe Probe-wifi
    set services ip-monitoring policy Server-trkwifi then preferred-route route 0.0.0.0/0 next-hop 5.6.7.1
    set services ip-monitoring policy Server-trkwifi1 match rpm-probe Probe-wifi1
    set services ip-monitoring policy Server-trkwifi1 then preferred-route route 0.0.0.0/0 next-hop 1.2.3.2


  • 8.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-13-2020 11:14

    Hello silverst8p,

     

    Instead of using cumbersome RPM, you can also achieve this by configuring BFD for the static route.

    Once the BFD realizes that next-hop has become un-reahcable it will remove the static route configuration. Once the next-hop is reachable the static route will configured again.

     

    Here is really good example:

     

    https://www.juniper.net/documentation/en_US/junos/topics/topic-map/policy-bfd-static-routes.html

     

    To prefer one ISP over another you can use metric with the static route.

     

    PS: Please mark my response as solution if it answer your query, kudos are appreciated too!

     

    Thanks

    Vishal



  • 9.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-13-2020 11:36

    Hi silverst8p

     

    After reviewing the configuration the problem seems to be th following one:

     

    1. Traffic from hosts on 192.168.8.0/24 (except for .100) will reach the SRX on interface ge-0/0/2 and will hit F1 filter which places the traffic under routing-instance FBF-1 which sends the traffic over ISP 1. This is fine but what happens when you disconnect ge-0/0/0 (ISP1)?

    2. Routing-instance FBF-1 loses the next-hop (1.1.1.1) for its default route hence its default route is no longer valid, however at this point the traffic from 192.168.8.0/24 is still placed on this routing-instance. We need to make sure FBF-1 has a backup default route, however the RPM configuration is not taking care of this situation because the default route that is injecting is not the correct one:

     

    ip-monitoring {
            policy Server-Tracking {
                match {
                    rpm-probe Probe-Server;
                }
                then {
                    preferred-route {
                        routing-instances FBF-1 {
                            route 0.0.0.0/0 {
                                next-hop 1.1.1.1;
                            }
                        }

     

    The route that we need to inject is "0.0.0.0/0 next-hop 2.2.2.1" so that FBF-1 could send the traffic over ISP2.

     



  • 10.  RE: FBF filter-based forwarding dual ISP failover

     
    Posted 03-13-2020 11:41

    Note the same situation occurs with the RPM policy Server-Tracking1, where the route that it should inject is "0.0.0.0/0 next-hop 1.1.1.1" so that FBF-2 can send traffic via ISP1 should the monitoring over ISP 2 fails.

     

    Whenever you disconnect any of the ISPs make sure the probes are failing and that the routes are getting injected properly:

     

    show services ip-monitoring status

    show services rpm probe-results

     

     



  • 11.  RE: FBF filter-based forwarding dual ISP failover

    Posted 03-13-2020 12:37

    I changed the routes to look like:

    policy Server-Tracking {
        match {
            rpm-probe Probe-Server;
        }
        then {
            preferred-route {
                routing-instances FBF-1 {
                    route 0.0.0.0/0 {
                        next-hop 2.2.2.1;
                    }
    } } } } policy Server-Tracking1 { match { rpm-probe Probe-Server1; } then { preferred-route { routing-instances FBF-2 { route 0.0.0.0/0 { next-hop 1.1.1.1; } } } } }

    But I'm not sure that's what you meant, I tried to add a backup route instead of a preferred route in

     

    ip-monitoring {
        policy Server-Tracking {
            match {
                rpm-probe Probe-Server;
            }
            then {
                preferred-route {
                    routing-instances FBF-1 {
                        route 0.0.0.0/0 {
                            next-hop 2.2.2.1;

    But I didn't see an option for that.

     

    I ran the show services first with both connected, then ISP1 disconnected, then ISP2 disconnected and got:

     

    show services ip-monitoring status
    
    Policy - Server-Tracking (Status: FAIL)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server           testsvr         1.1.1.1      FAIL
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-1             0.0.0.0/0         2.2.2.1        APPLIED
    
    Policy - Server-Tracking1 (Status: PASS)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server1          testsvr         2.2.2.1        PASS
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-2             0.0.0.0/0         1.1.1.1      NOT-APPLIED
    
    root@taylors> show services ip-monitoring status
    
    Policy - Server-Tracking (Status: FAIL)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server           testsvr         1.1.1.1      FAIL
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-1             0.0.0.0/0         2.2.2.1        APPLIED
    
    Policy - Server-Tracking1 (Status: PASS)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server1          testsvr         2.2.2.1        PASS
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-2             0.0.0.0/0         1.1.1.1      NOT-APPLIED
    
    root@taylors> show services ip-monitoring status
    
    Policy - Server-Tracking (Status: FAIL)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server           testsvr         1.1.1.1      FAIL
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-1             0.0.0.0/0         2.2.2.1        APPLIED
    
    Policy - Server-Tracking1 (Status: PASS)
      RPM Probes:
        Probe name             Test Name       Address          Status
        ---------------------- --------------- ---------------- ---------
        Probe-Server1          testsvr         2.2.2.1        PASS
      Route-Action:
        route-instance    route             next-hop         state
        ----------------- ----------------- ---------------- -------------
        FBF-2             0.0.0.0/0         1.1.1.1      NOT-APPLIED

    It looks like RPM does detect when one link goes down, so I guess that part is working? If I could just get RPM to trigger the right routes I guess it would work?

     

    I think my firmware version is too old for BFD, so not sure that's an option.