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Firewall filter in a switch running Junos OS 21.4R3-S2, Please could you confirm if the syntax /script is correct?

  • 1.  Firewall filter in a switch running Junos OS 21.4R3-S2, Please could you confirm if the syntax /script is correct?

    Posted 21 days ago

    Firewall filter in a switch running Junos OS 21.4R3-S2, Please could you confirm if the syntax /script is correct?

    Thanks

    Host1: 10.1.1.1 (switch)
    Host2: 10.3.1.2 (server)

    configure
    set firewall family ethernet-switching filter FILTER1 term TERM1 from destination-address 10.3.1.2
    set firewall family ethernet-switching filter FILTER1 term TERM1 from source-address 10.1.1.1
    set firewall family ethernet-switching filter FILTER1 term TERM1 then count inbound-counter-SW1-SRV-R1
    set firewall family ethernet-switching filter FILTER1 term TERM1 then accept

    set firewall family ethernet-switching filter FILTER1 term TERM2 from destination-address 10.1.1.1
    set firewall family ethernet-switching filter FILTER1 term TERM2 from source-address 10.3.1.2
    set firewall family ethernet-switching filter FILTER1 term TERM2 then count outbound-counter-SRV-SW1-R1
    set firewall family ethernet-switching filter FILTER1 term TERM2 then accept

    set firewall family ethernet-switching filter FILTER1 term DEFAULT-accept then accept

    set firewall family ethernet-switching filter FILTER2 term TERM1 from destination-address 10.3.1.2
    set firewall family ethernet-switching filter FILTER2 term TERM1 from source-address 10.1.1.1
    set firewall family ethernet-switching filter FILTER2 term TERM1 then count outbound-counter-SW1-SRV-SRV
    set firewall family ethernet-switching filter FILTER2 term TERM1 then accept

    set firewall family ethernet-switching filter FILTER2 term TERM2 from destination-address 10.1.1.1
    set firewall family ethernet-switching filter FILTER2 term TERM2 from source-address 10.3.1.2
    set firewall family ethernet-switching filter FILTER2 term TERM2 then count inbound-counter-SRV-SW1-SRV
    set firewall family ethernet-switching filter FILTER2 term TERM2 then accept

    set firewall family ethernet-switching filter FILTER2 term DEFAULT-accept then accept


    set interfaces et-0/0/8 unit 0 family ethernet-switching filter input FILTER1
    set interfaces et-0/0/8 unit 0 family ethernet-switching filter output FILTER1

    set interfaces xe-1/0/18:0 unit 0 family ethernet-switching filter input FILTER2
    set interfaces xe-1/0/18:0 unit 0 family ethernet-switching filter output FILTER2



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    ALAIN ASSELIN
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  • 2.  RE: Firewall filter in a switch running Junos OS 21.4R3-S2, Please could you confirm if the syntax /script is correct?

    Posted 17 days ago

    The filter will work, no problem, it's just that ALL traffic will work ;) For firewall filters, there is an implicit allow in the end. If you don't deny anything, it will allow everything!

    Are both your "DEFAULT-accept then accept" meant to be discard?

    The syntax checks out on an EX4100 running 22.3R2-S2.