Networking help

[pll at lanminds.com]

In a message dated: Mon, 25 Nov 2002 10:02:11 EST
Kevin D. Clark said:

systemA		192.168.10.10
systemB		10.241.38.11
systemC		10.241.38.16

>Can you ping "A" from "C"?

I can ping from/to
	systemA <-> systemB
	systemB <-> systemC

but NOT systemA<->systemC.


When trying to ping between A and C, C recieves icmp requests, but does not
send replies.  Though after a while (>20 secs), ping will eventually 
respond.


>Does "C" have some kind of host route setup

No.

>Are *all* of the routing tables OK?

Yes.

For all intents and purposes, other than IP addresses and some 
services, the two hosts are identical (B is running Apache2, C is 
running apache1.x)

Additionally, this is not necessarilly restricted to just systemC.  
There are other systems on the same subnet which exhibit the same 
problem when pinging from systemA.

The major difference between systemB and these other systems, is that 
systemB, once a day at 19:00, initiates an rsync to a system *off* the subnet.
systemB happens to mirror the RH/debian distros and kernel.org.

The only thing I can come up with is that the router these systems 
all connect to age the arp cache out over time and that the rsync 
lasts long enough such that it's entry is always in the arp cache of 
the router when I need to connect to it.

Though even that doesn't make sense, since I've proven that systemC 
does, in fact, hear the icmp requests from A, it just doesn't reply 
to them.
-- 

Seeya,
Paul
--
	It may look like I'm just sitting here doing nothing,
   but I'm really actively waiting for all my problems to go away.

	 If you're not having fun, you're not doing it right!