🚀 go-pugleaf

At 10:50 1/27/93 +0000, Glyn Simpson wrote:
>I think this is more of a software problem rather than a routing problem.
>I'm running 8.2(7) on out Cisco AGS+/3 quite successfully until a few
>days ago. During that time, we lost our X.25 link to the outside world,
>through which we encapsulate our IP packets. When the line was down, a
>host on our local network broadcast to fact that it knew how to get to 
>the route 0.0.0.0 (ie the default) in 2 hops (yes, one hop to itself,
>and one back to the cisco) - hence a routing loop was formed. 
>
>This isnt the problem though. The problem then occurred in that the 
>Cisco changed its configuration to point to this host as the default
>route, and subsequently, when the X.25 switch was brought back up, 
>routing was mangled.
>

You need to defend yourself from other routers, either through the use of
administrative distance or an input filter on RIP (don't accept the default
route from anyone).

>Is this a known problem, and do i need to upgrade software (i think one
>is on the cards when we *finally* get the FDDI card we've been promised
>for months, and has not yet appeared. 
>
>Thanks in advance.
>
>--
>Glyn Simpson, Systems Officer,  //  Voice: +44 (0) 21 414 6575
>University of Birmingham        //  Fax:   +44 (0) 21 414 3952
>Email: G.Simpson@bham.ac.uk     //  NIC Handle: GS56

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