Re: ip_rt_advice

Garner (gbc@transbay.net)
Thu, 8 Apr 1999 12:19:55 -0700

Just because your machine is not forwarding packets does not mean that it does
not need routes. For instance, any machine that wishes to contact the outside
world needs a default route. I think it simply is telling you that a temp
route that was added due to an ICMP redirect from another machine has expired
and has therefore been removed. You seem to be getting debug messages though:
route.c: printk(KERN_DEBUG "ip_rt_advice: redirect to
%d.%d.%d.%d/%02x dropped\n", NIPQUAD(rt->rt_dst), rt->key.tos);

garner

Denis Chapligin wrote:

> ????????????
>
> On 8 Apr 1999, Andi Kleen wrote:
>
> > > I have a strange messages at /var/log/debug:
> > > Apr 7 19:25:00 hurricane kernel: ip_rt_advice: redirect to 194.186.140.201/00 dropped
> > > Apr 7 19:25:14 hurricane kernel: ip_rt_advice: redirect to 194.186.140.201/00 dropped
> > >
> > > But this addresses are really exist in my network. During this messages,
> > > machines with this ip are not available. What does this mean?
> >
> > Someone sent you a ICMP redirect for these IPs. The kernel installed
> > a temporary route for it. Because these hosts didn't answer it concludes
> > after some time that the redirect was bad and removes the temporary route.
> > If it bothers you feel free to comment it out, but it would be better to
> > fix the routing so that no ICMP redirect is needed.
> >
> I don't need routing for this machines, because they all are in one
> ehternet segment. So, i can't understand, where the problem with
> routing? May be this is an hacker attack?
> Denis Chapligin
>
>
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