mpd, ng, Cisco VPN, resource leak

From: Christoph Kukulies <kuku_at_physik.rwth-aachen.de>
Date: Mon, 16 Jun 2003 16:03:55 +0200
For months I'm trying to get back to a working VPN using mpd
on a FreeBSD 4.4 client site and a Cisco VPN server on the peer end.

With 5.0 and 5.1-current the network connection stopped working.

I could work for a minute or so then the connection got hung.
Trying to reconnect with a new ssh session got some message
about 'resource deadlock avoided' and a subsequent ping to the peer side
gets the onminous 'no buffers space available' or an additional :


kuku_at_www$ ssh acc01
ssh: connect to host acc01 port 22: Connection refused
kuku_at_www$ ping acs01
PING acc01 (138.134.123.12): 56 data bytes
ping: sendto: Resource deadlock avoided
ping: sendto: No buffer space available
ping: sendto: No buffer space available
^C
--- acc01 ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss


The connection refused occurs on the peer side where the previous
ssh connection had succeeded. It's not that the sshd died. Rebooting
my system allows be to connect again for a minute or 2 and then again
the hang.

How could I pinpoint the problem so that some knowing kernel/netgraph person
will be available to find the cause?

Is there a way to do a continous netstat -m  or vmstat -m during a session
setup? I mean other than writing it to a file in a shell while loop?

--
Chris Christoph P. U. Kukulies kukulies_at_rwth-aachen.de
Received on Mon Jun 16 2003 - 05:03:58 UTC

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