Networking help

[pll at lanminds.com]

In a message dated: Fri, 13 Dec 2002 19:41:16 EST
bscott at ntisys.com said:

>  Second: That diagram is incomplete.  It does not give networks (although I
>can infer most of it), and at least one key gateway has been left out.

Not really...

>  Is the above analysis accurate?

Close...

> In particular, what is T?

T doesn't actually exist.  It was planned, but then the need for it 
went away/changed, so never got implemented.  Which may have been the 
cause for my problem all along, though I don't understand why.

Granted, traffic routed to that gateway would never get anywhere, but 
in theory, there should never be any traffic destined for that 
gateway!  If I'm coming in on the 10.241.38/24 interface to a node, 
then the return traffic should follow the routh for that network.  
Even though there were 2 default routes, shouldn't the traffic (in 
theory) get sent out both interfaces (if what you described as 
"matching all packets" is accurate)?


>  Way back when you first started this thread, you mentioned that you can
>ping between B and C even when you cannot ping from A and C.  When that was
>happening, did you verify what interfaces the ICMP packets were going
>through?

Yes, I had tcmdump monitoring all interfaces on C, and there were no 
'icmp echo reply' packets being generated for any of the interfaces.  
The 'icmp echo request' was coming in on the 10.241.38/24 interface.

And, as much as I hate to admit that Derek might have been right 
about anything, it appears that may be the case ;)  I removed the 
gateway from the 192.168.10/24 interfaces, and haven't noticed a 
recurrence of the problem since then (of course, since this was a 
totally sporatic problem, I'm not totally convinced that it is 
solved, but it's looking like it).

>  Are you running any routing daemons, link monitoring/fail-over software,
>or anything like that?

Nope.
-- 

Seeya,
Paul
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