Default route changes unexpectedly

[Sami Halabi]

Hi,
I can say also i faced this problem in 9.1-preRelease. And i'm not using
pf, i usyally use ipfw. but i didn't see this happening for a while...

Sami
On Mar 5, 2013 7:39 PM, "Nick Rogers" <ncrogers at gmail.com> wrote:

> Hello,
>
> I am attempting to create awareness of a serious issue affecting users
> of FreeBSD 9.x and PF. There appears to be a bug that allows the
> kernel's routing table to be corrupted by traffic routing through the
> system. Under heavy traffic load, the default route can seemingly
> randomly change to an IP address that is not directly connected to the
> network (i.e., is not configured anywhere). Dhclient is not in the
> mix, nor is routed, bgpd, etc. Running `route monitor` shows no
> evidence of the change in the default route. The one commonality
> between all the systems experiencing this problem seems to be the use
> of PF.
>
> Obviously this is a serious problem as it causes all Internet-bound
> traffic to stop routing until the default route is corrected. Some
> users, including myself, are working around this problem by installing
> a script that runs multiple times a second to check if the default
> route is incorrect and fixing it if necessary, which mitigates the
> amount of downtime caused by the bug.
>
> Please refer to these past posts for more examples and evidence of
> other users experiencing this problem:
>
> http://forums.freebsd.org/showthread.php?p=211610#post211610
>
>
> http://freebsd.1045724.n5.nabble.com/Default-route-quot-random-quot-gateway-modification-bug-td5750820.html
>
> http://lists.freebsd.org/pipermail/freebsd-net/2012-March/031879.html
>
> http://lists.freebsd.org/pipermail/freebsd-ipfw/2010-September/004361.html
>
> There is also a PR that was incorrectly labeled as an IPFW issue.
> Myself and others believe this issue is not restricted to the use of
> IPFW and that the PR should be relabeled. I am inclined to think it is
> strictly a PF issue since I am not using IPFW, however there is
> evidence of the default route changing on people using IPFW for past
> versions of FreeBSD (7.x/8.x), so perhaps this is related.
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/174749
>
> Another PR for the same problem but specific to IPFW and 8.2-RELEASE
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=157796
>
> I am hoping someone reading this can give the problem the attention it
> deserves. Thank you.
>
> -Nick
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