[lug] weird networking on a multi-homed host

[Sexton, George]

ping -n

Name server resolution issues.

-----Original Message-----
From: lug-admin at lug.boulder.co.us [mailto:lug-admin at lug.boulder.co.us]On
Behalf Of Hugh Brown
Sent: 27 August, 2001 10:20 AM
To: lug at lug.boulder.co.us
Subject: [lug] weird networking on a multi-homed host


I have a host acting as a firewall with two NIC's in it.  I was trying to
do a net install on it (with the external NIC disconnected) and I couldn't
get anything to go.  So I did some testing.  eth0 is the external interface
and eth1 is the internal interface.  server is the multi-homed host and
client is a machine on the internal lan.

when I disconnect the cable to server:eth0 and try and ping client from
server, I get next to nothing showing up on server.  When I sniff packets
on client though, I see all of the ping requests come through just fine.
If I ping server from client I see all of the requests come back fine, but
the sniffer on server shows nothing coming through.

So

ping server->client   mostly fails (I get about 5 responses, the first one
shows up after a while, but shows a 1ms response time, the next response
showed 80000ms, then 160000ms, then 320000, then 640000 ...)

ping client->server works fine

I'm at a loss.

Hugh
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