From owner-freebsd-net@FreeBSD.ORG  Mon Mar 20 12:16:45 2006
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Date: Mon, 20 Mar 2006 04:16:07 -0800
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Ludovit Koren <lk@tempest.sk>
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Cc: freebsd-net@freebsd.org
Subject: Re: static routes
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On 2006-03-20 12:51, Ludovit Koren <lk@tempest.sk> wrote:
>
> Hi,
>
> I realized on several different versions of FreeBSD including
> 5.4-STABLE, when using static routes to specific subnets and the WAN
> link goes down for unpredictable reasons, the server gets ICMP
> redirect message and rearranges routes to use default router. Then all
> the traffic is routed to the default router even the WAN link is again
> up. Other unix like system (HP-UX, Linux) do not act the way,
> i.e. they do not change static routes.
>
> Should not be ignored the ICMP redirect messages concerning static
> routes?

That depends on what you have configured the system to do.  You can set
the net.inet.icmp.drop_redirect sysctl to 1 to drop them.