[Openswan Users] ipsec / xl2tpd disconnecting in just under 1 hour

[Matthew Twomey]

Greetings,

I've set up a "road warrior" style l2tp tunnel from a Linux client to a 
Linux host, but I it seems to drop consistently just under the 1 hour 
mark. It appears to drop weather I'm using it or not (so it doesn't 
appear to be an idle timeout). I'm fairly new to this sort of thing in a 
Linux environment, but here's what I'm seeing in the logs.

On the server just prior to the drop:

##### /var/log/messages/
Apr 19 21:28:08 vyatta pluto[2019]: "remote-access-mac-zzz"[176] 
X.X.X.X:10941 #173: initiating Quick Mode PSK+ENCRYPT+TUNNEL+DONTREKEY 
to replace #171 {using isakmp#172}
Apr 19 21:28:08 vyatta pluto[2019]: "remote-access-mac-zzz"[176] 
X.X.X.X:10941 #173: Dead Peer Detection (RFC 3706) enabled
Apr 19 21:28:08 vyatta pluto[2019]: "remote-access-mac-zzz"[176] 
X.X.X.X:10941 #173: sent QI2, IPsec SA established {ESP=>0xd56eda44 
<0xb3160bce NATOA=0.0.0.0}
Apr 19 21:28:47 vyatta xl2tpd[2262]: Maximum retries exceeded for tunnel 
49382.  Closing.
Apr 19 21:29:42 vyatta pppd[8828]: Modem hangup
#####

This is followed up with additional messages about things disconnecting.

On the client side I see (apologies, but the clock is off currently on 
one side - these logs are from the same timeframe):

##### /var/log/daemon
Apr 19 16:28:46 localhost xl2tpd[16159]: Maximum retries exceeded for 
tunnel 35420.  Closing.
Apr 19 16:28:47 localhost xl2tpd[16159]: Terminating pppd: sending TERM 
signal to pid 16216
#####

The client is an Ubuntu 10.10 system and the server is a Vyatta software 
router:

#####
$ uname -a
Linux vyatta 2.6.35-1-586-vyatta #1 SMP Fri Feb 4 05:07:37 PST 2011 i686 
GNU/Linux
#####

I'm not sure where I should be looking here or how to continue 
troubleshooting?

Thanks,

-Matt