arp entries for local interfaces disappearing ?

Ruslan Ermilov ru at FreeBSD.org
Thu Apr 8 13:10:49 PDT 2004


On Wed, Apr 07, 2004 at 10:13:07PM +0300, Ruslan Ermilov wrote:
> On Wed, Apr 07, 2004 at 11:50:53AM -0700, Luigi Rizzo wrote:
> > On Wed, Apr 07, 2004 at 09:38:43PM +0300, Ruslan Ermilov wrote:
> > ...
> > > >     ? (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...
> > > > 
> > > Here it doesn't disappear.  Perhaps, you have some routing daemons
> > 
> > i suspect you are not supposed to make statements before
> > net.link.ether.inet.max_age seconds :)
> > 
> :-)
> 
> > seriously though, i see this consistently on all 4.9 boxes
> > around here... the parent route entries are still there, no
> > routing daemons running, no ifconfig's issued...
> > 
> $ ifconfig rl0
> rl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet 10.71.1.80 netmask 0xffffff00 broadcast 10.71.1.255
>         ether 00:50:fc:79:da:85
>         media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
> $ arp -n 10.71.1.80
> ? (10.71.1.80) at 00:50:fc:79:da:85 on rl0 permanent [ethernet]
> 
> I will see if I still have it tomorrow...
> 
Grr, rebooted the box before I've checked.  Anyway, after a reboot
I pinged it so that the entry appears, and after 6 hours it's still
there:

$ uptime
23:08  up  6:35, 6 users, load averages: 0,00 0,01 0,00
$ arp -n 10.71.1.80
? (10.71.1.80) at 00:50:fc:79:da:85 on rl0 permanent [ethernet]

And no, I don't normally have this entry.  (All 6 users is me.)


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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