Default route "random" gateway modification bug

[Dominic Blais]

Hi (sorry, I clicked send too fast ;) ),

I had to change the server of my customer who have this bug because we wanted to put 2 redundant servers with carp...  I removed the old server and replaced it with 2 brand new ones. <delete>The old one was an HP ML115 and the new ones are Lenovo TS120</delete>. The new servers are the same model (HP ML115).

I used the same software:

               - FreeBSD 9.0
               - MPD 5.6
               - IPFW (pipes only + single pass all rule)
               - PF ruleset for filter and NAT.

And only added:
               kldload if_carp.ko

The problem just happened this last night with that configuration so I may say it should be replicable if someone did use the same FreeBSD version with ipfw for pipes and pf for rules/nat. We still don't know what is exactly messing up with the default gateway but we know that it is something with the mix of FreeBSD 9, IPFW for pipes and PF for NAT. You must add some traffic to it to make it happen since it looks like it's using an IP of a host the users communicated with to replace the gateway. I often see, but not only, Microsoft owned IP as my default gateway when it happens.





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