On Thu, 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
> > >
> >
> > Check to see if any of the machines are running the routed daemon. This
> > is running by default on Sun machines. This causes them to advertise
> > routes (even though they share the same wire as everybody else). This
> > results in strange routing-table entries on cooperating machines and
> > duplicate packets on the physical link.
>
> ICMP route redirect has nothing to do with the route daemon, it is generated
> on Unix systems by the Kernel (on Linux only when it is not configured
> as a router, as per RFC1812)
>
> Usually it happens when you have missing routes to some box on the same network
> and your default gateway is misconfigured and issues redirects.
>
Okay. You mean, that if i reconfigure my default gateway, this annoing
messages will go away? But why during this messages i can't see machine
about are talked at ip_rt_advice log entry?
> In general you're right though, dynamic routing (routed) on non-router boxes
> does usually more harm than good, with the exception of router discovery.
>
I use only static routing inside my network
Denis Chapligin
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