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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!think.com!barmar
- From: barmar@think.com (Barry Margolin)
- Newsgroups: comp.sys.sun.admin
- Subject: Re: message from Unknown router
- Date: 2 Sep 1992 19:21:11 GMT
- Organization: Thinking Machines Corporation, Cambridge MA, USA
- Lines: 34
- Message-ID: <183477INN9cp@early-bird.think.com>
- References: <1992Sep2.144249.11124@samba.oit.unc.edu>
- NNTP-Posting-Host: telecaster.think.com
-
- In article <1992Sep2.144249.11124@samba.oit.unc.edu> Shawn.Hayes@bbs.oit.unc.edu (Shawn Hayes) writes:
- >Hi. A freind of mine has a few Sparcstations that he is managing and
- >he is having a few proplems with a message showing up every few minutes
- >from an unknown router. His machines are hooked up to thicknet backbone
- >which is tied into a corporate network. The unknown router is not one
- >of his machines. Has anyone run into a similar problem and what changes
- >are likely to fix the problem.
-
- That message is printed by in.routed when it receives a routing table from
- a router that's not on the local subnet and not listed in /etc/gateways.
-
- We saw this when we were running two logical subnets on one physical net,
- using a cisco router's "secondary address" feature. In order to get the
- router to send RIP broadcasts that hosts on both subnets would receive, we
- had to configure it to use the 255.255.255.255 broadcast address rather
- than net.net.subnet.255. This caused machines on each logical subnet to
- see the broadcast from the router's address on the other subnet.
-
- This could also happen if your routers are configured to forward
- broadcasts. This is often not correct, so you may have a router
- configuration problem.
-
- If they determine that the routers are correctly configured, then you can
- silence in.routed by putting an entry for the unknown router in
- /etc/gateways on each machine that complains. The entry will be ignored
- when making routing decisions, because a machine can only route through a
- machine on the same subnet anyway, but it will be a "known" router and thus
- not generate warnings.
-
- --
- Barry Margolin
- System Manager, Thinking Machines Corp.
-
- barmar@think.com {uunet,harvard}!think!barmar
-