arp entries for local interfaces disappearing ?

From: Luigi Rizzo (luigi_at_freebsd.org)
Date: 04/07/04

  • Next message: Ruslan Ermilov: "Re: arp entries for local interfaces disappearing ?" 
    Date: Wed, 7 Apr 2004 10:57:48 -0700
To: net@freebsd.org

    Can someone explain why, in my arp table, i don't have an
    entry for my local machine ? I just noticed this by chance,
    on my 4.9 box at the office, and now again at home:

    > ifconfig
        rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
                inet 10.0.1.55 netmask 0xffffff00 broadcast 10.0.1.255
                inet 10.1.1.236 netmask 0xffffff00 broadcast 10.1.1.255
                ether 00:40:f4:34:b1:4b
                media: Ethernet autoselect (100baseTX <full-duplex>)
                status: active
        lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
                inet 127.0.0.1 netmask 0xff000000
    > arp -na
        ? (10.0.1.52) at 00:02:2d:08:a3:3b on rl0 [ethernet]
        ? (10.0.1.64) at 52:54:05:de:99:7c on rl0 [ethernet]
    >

    the interface is actually up and moving traffic -- the box is talking
    to 10.0.1.52.
    The route magically reappears if i try to open a session to the
    local box using the interface's address:

    > ssh 10.0.1.55
          ... bla bla bla ...
    > arp -na
        ? (10.0.1.52) at 00:02:2d:08:a3:3b on rl0 [ethernet]
        ? (10.0.1.55) at 00:40:f4:34:b1:4b on rl0 permanent [ethernet]
        ? (10.0.1.64) at 52:54:05:de:99:7c on rl0 [ethernet]

    and it's marked permanent, so it should not expire! Yet it
    looks like they do anyways...

    cheers
    luigi
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  • Next message: Ruslan Ermilov: "Re: arp entries for local interfaces disappearing ?"

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