Messages in this thread | | | Date | Fri, 9 Apr 1999 10:31:26 +0300 (EEST) | From | Denis Chapligin <> | Subject | Re: ip_rt_advice |
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Hi
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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