Networking help

[Marc Evans]

When I have seen these in the past, I have usually found them to be caused
by an ARP issue. Try flushing the arp cache on the systems involved and
then retry you experiment. If that doesn't work, look at all routers on
the network to insure that proxy-arp is disabled.

- Marc

On Mon, 25 Nov 2002 pll at lanminds.com wrote:

>
> Hi all,
>
> I have a very bizarre problem going on here. I have a system on a
> different subnet.  From my desktop, I ping the system and get no
> response.
>
> I ssh to another system on the same subnet, and can ping that system.
> Additionally, I can ssh to that system from the system on the same
> subnet.
>
> The route tables look fine, the interface is up, and can ping stuff
> off it's local subnet.
>
> If I run 'tcpdump -i eth1 icmp' on this system, then ping it from my
> desktop, I see the 'icmp echo request' coming in, but no
> 'icmp echo reply' going out.
>
> There is no ipchains/tables running, no tcpwrappers or anything that
> should be blocking icmp, or any other network activity.
>
> Eventually, if I leave the ping on my desktop running (i.e. don't
> Ctrl-C it) the remote system will answer.
>
> Pertinent systems specs:
>
>   Monolithic kernel (no modules):
>     Linux www 2.4.19 #1 Thu Aug 15 18:08:58 EDT 2002 i686 Pentium III (Coppermine)
>     GenuineIntel GNU/Linux
>
>   3 NICs (only using eth0/1 currently):
>   eth2 01:05.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
>   eth1 02:04.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 0d)
>   eth0 02:05.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 0d)
>
>   Debian (woody)
>
> Anyone have any insights on this one?  Interestingly, I have several
> systems which are all identical (Hardware and OS installation).  Some
> have this problem, others don't.
>
> Thanks,
> --
>
> 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!
>
>
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