Wi-Fi bridge interferes with CARP

Andrea Venturoli ml at netfence.it
Fri Oct 23 08:55:48 UTC 2009


Hello.

I'm curios about something which happened during a test in one of my 
networks.
Two FreeBSD 6.3 boxes (one i386, one amd64) share some IP through CARP.

Now, as soon as I plugged a wi-fi bridging access point on the net 
(which took it's IP from DHCP only for management), I started to see 
this in the i386 box's logs:

Oct 22 09:49:04 xxxxx kernel: arp_rtrequest: bad gateway 192.168.101.10 
(!AF_LINK)
Oct 22 09:49:04 xxxxx kernel: carp0: MASTER -> BACKUP (more frequent 
advertisement received)
Oct 22 09:49:07 xxxxx kernel: arp_rtrequest: bad gateway 192.168.101.10 
(!AF_LINK)
Oct 22 09:49:07 xxxxx kernel: carp0: MASTER -> BACKUP (more frequent 
advertisement received)
...
and so on every 3 seconds.

The above IP is the one the two machines are sharing on the local network.
Nothing like that appeared on the amd64 box.



Only one Windows machine was (sometimes) using the access point.



Did anyone experience such a thing?
Any clue?


  bye & Thanks
	av.


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