arp: <some ether addr> is using my IP address <some IP addr> again.

[Russell Adams]

Quoting Mike Hunter <mhunter at ack.Berkeley.EDU>:

> On May 19, "Russell Adams" wrote:
> 
> > I have seen this question posted twice to the list each without any
> response. 
> > Does anybody out there know if this is possible, a Yes or No, will do if
> you
> > can't offer anything else. If it is possible then how do we get rid of the
> > Arp/IP conflict problem.
> > 
> > This is what I want to do:
> > 
> > A transparent bridge with no IPs (2 NICs)
> > A 3rd NIC to access the box via SSH for monitoring and configuration.
> > 
> > this is what I have done.
> > 
> > xl0 and xl1 set up as a transparent bridge, no ips
> > rl0 set up as 192.168.30.254 on the LAN
> > Bridge is inbetween 192.168.30.1 (ROUTER to Internet) and 5500 Cisco
> Switch.
> > 
> > I log in via SSH to configure the bridge via rl0, so far so good. I plug in
> the
> > bridge between the router and the switch via xl0 and xl1, the bridge begins
> to
> > pass packets perfectly. BUT now rl0 is not reachable via anything, no even
> a
> > ping. Login into the console for investigation I find this message:
> > 
> > FreeBSD Kernel: Arp: 00:00:00:00:00 is using my IP address 192.168.30.254
> > FreeBSD Kernel: Arp: 11:11:11:11:11 is using my IP address 192.168.30.254
> > 
> > The 00 and 11 MACs address representing the MAC for the 2 NICs that are
> part of
> > the bridge. 192.168.30.254 was the previously working admin interface
> accepting
> > conections via SSH.
> > 
> > Below is are 2 unanswered posts that are  asking the same thing but both
> are
> > regarding 4.8, I am using 5.2.1
> > 
> > 
> > http://lists.freebsd.org/mailman/htdig/freebsd-net/2003-June/000586.html
> >
> http://lists.freebsd.org/mailman/htdig/freebsd-net/2003-December/002109.html
> 
> I never had any trouble passing traffic, but I did get spurious arp error
> messages.  In my /etc/rc.conf, I specifically disabled arp on the bridge
> interfaces, and the messages went away.  I think I saw that suggestion on
> an archived mailing list post somewhere.
> 
> Good luck,
> 
> Mike
> 
> 

I don't really mind the error messages, I just want it to work...  the bridge
works great, the problem is the 3rd admin NIC stops working as soon as the
bridge interfeaces are up and running. Do you think that turning off arp will
allow my 3rd NIC to start working again? I will give it a try and see what
effect it has on the situation, thanks for you comments!

Russ