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  • 1.  proxy-arp on 19.4R3-S8.6

    Posted 07-09-2022 04:12

    Hi, all.

    HW: MX104, 19.4R3-S8.6

    Interface configuration:
    x@router0> show configuration interfaces ge-0/0/4.1031
    vlan-id 1031;
    family inet {
    unnumbered-address lo0.1;

    Route table:
    Internet.inet.0: 856733 destinations, 1583377 routes (856733 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both *[BGP/170] 1d 20:29:49, localpref 100, from x.x.x.x

    x@router0> monitor traffic no-resolve interface ge-0/0/4.1031
    verbose output suppressed, use <detail> or <extensive> for full protocol decode
    Address resolution is OFF.
    Listening on ge-0/0/4.1031, capture size 96 bytes

    10:54:17.148597 In arp who-has tell
    10:54:18.166338 In arp who-has tell
    10:54:19.190364 In arp who-has tell
    10:55:17.118386 In arp who-has tell
    10:55:18.135908 In arp who-has tell
    10:55:19.159885 In arp who-has tell

    The problem is that the router does not respond to arp requests coming from client's side (client ip, that connected to ge-0/0/4.1031 is

    proxy-arp is set (tried to set unrestricted, but nothing changes).  The route to network is in the routing table. What could be the problem?

  • 2.  RE: proxy-arp on 19.4R3-S8.6

    Posted 07-09-2022 06:02
    I'm not sure I follow the configuration but it looks like the following.

    You have the loopback on the interface facing the client and you want to proxy arp for a  device on this interface.

    SRX will proxy arp on an interface that includes a subnet for traffic being processed by nat and security policy rules, not for outside devices.

    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)

  • 3.  RE: proxy-arp on 19.4R3-S8.6

    Posted 07-09-2022 06:13
    On vMX (18.4)  there is no such problem with the same configuration :)