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- Newsgroups: comp.dcom.sys.cisco
- Path: sparky!uunet!sun-barr!ames!agate!boulder!recnews
- From: Peter Hakanson <peter@cyklop.volvo.se>
- Subject: bug in 9.0(1) ?
- Message-ID: <199208310915.AA03345@mail.swip.net>
- Mailer: Elm [revision: 66.33]
- Sender: news@colorado.edu
- Date: 31 Aug 92 11:11:27 METDST
- Lines: 21
-
- Recently we discovered strange behaviour in 9.0(1).
- We route tcp/ip decnet and appletalk and bridge LAT in a
- newly installed MGR.
- ARP requests done on lan-s connected to this router are
- FORWARDED to all interfaces! Even worse, since they are
- forwarded to a AGS with 8.3(3), the AGS has no way of
- protecting himself, but instead the AGS will put the ARP-s
- to all of hi's interfaces. In one case he substituded the
- original ip-address with the AGS ip-address.
-
- Looking on the faulty MGS with 'debug arp' shows:
- ARP req filtered src 131.97.100.21 0800.0101.68c1, dst 131.97.21.15 0000.0000.0000 wrong cable
- ARP req filtered src 131.97.100.23 0800.200f.2991, dst 131.97.23.11 0000.0000.0000 wrong cable
- IP ARP: rcvd req src 131.97.100.26 0800.0101.6e3d, dst 131.97.100.99
-
- The 'wrong cable' is an indication of the problem.
-
- A 'fix' is to define a output-type list that explicity defines
- which types are to be forwarded(and not including ARP).
- -
- Peter Hakanson VolvoData Dep 2230 phone +46 31 66 74 27
-