W.Chris Shank on Fri, 4 Apr 2003 18:58:09 -0500


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Re: [PLUG] What causes this networking weirdness?

you may be on to something here. i wasn't able to checkout the messages cause everytime i got into the machine - it would soon hang. I did just change the hosts file so that the internal IP was set to localhost and the public IP that is portforwarded was set to the machine name.

I seem to be able to login without getting kicksed out now (fingers are crossed). This is what was waiting for me in the dmesg:

eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
portmap: server localhost not responding, timed out
portmap: server localhost not responding, timed out
portmap: server localhost not responding, timed out
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled
eth0: Link down
eth0: MII PHY ID: 406210 BCM 5201
eth0: Link is up at 100 Mbps, full-duplex.
eth0: Pause is disabled




On Friday, April 4, 2003, at 05:14 PM, Martin DiViaio wrote:


Can you ping the machine when the ssh session hangs?

What are the load averages on the machine during the hang?

What do the system logs show during the hang? (i.e. /var/log/*)

At a guess, it's most likely NOT a DNS problem. I had a similar problem
with a laptop. I eventually traced the problem to the kernel unloading the
ethernet card module. I never really figured out why and just recompiled
the kernel with the ethernet module compiled into the kernel and the
problem went away.

--
GPG Fingerprint: C900 18EF 0C36 4EAF A93C  F073 85D4 8B3C F3D8 077B

On the 4th day of April in the year 2003 you wrote:

Date: Fri, 4 Apr 2003 09:47:49 -0500 (EST)
From: W. Chris Shank <chris.shank@acetechgroup.com>
To: plug@lists.phillylinux.org
X-Spam-Status: No, hits=1.7 required=5.0
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Subject: [PLUG] What causes this networking weirdness?

I have a PPC with YDL 2.3 (RH 7.3 PPC) setup as a server. It is physically
on my local LAN (internal IP), behind the firewall. I have my router setup
to port forward SSH and port 80 requests to this machine - external IP. I
have added this external IP as a subdomain at my internet DNS provider. I
generally can SSH into the machine ok using the external IP and can see
the web server. However, a few minutes after I login vai SSH - the system
is unresponsive for several minutes. If I'm connected outside the LAN - I
lose the connection. If I'm connected to the internal IP from the LAN - it
will generally bring my session back, with all the keyboard commands
buffered.

I figure this must be a DNS or reverse-IP lookup issue that is causing the
networking to be unresponsive (until it times out?). I didn't notice this
behavior until I setup the DNS and port forwarding - but then again - I
didn't really use the machine until then - I was still burning it in.

The weird thing is that I had been port forwarding to a different machine
(x86) for SSH just fine (not port 80 though). It never timed out or
anything.

Is there something obvious that I've overlooked? Do I need my own DNS
internally? Any assistance is, as always, appreciated.

Thanks


______________________________________________________________________ ___
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_______________________________________________________________________ __
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.netisland.net/mailman/listinfo/plug-announce
General Discussion -- http://lists.netisland.net/mailman/listinfo/plug



_________________________________________________________________________
Philadelphia Linux Users Group        --       http://www.phillylinux.org
Announcements - http://lists.netisland.net/mailman/listinfo/plug-announce
General Discussion  --   http://lists.netisland.net/mailman/listinfo/plug