telnet/ssh disconnects... Possible NAT teardown?

[Jeremy]

--- Mike Klinke <lsomike at futzin.com> wrote:
> On Thursday 05 February 2004 16:49, Jeremy wrote:
> > Alright, I'm using Fedora Core 1.  My box is setup as a router for
> > the rest of my network.  It has two network cards, one 10 base card
> > connected to a cable modem, and another 10/100 connected to my
> > network switch.  I have iptables setup to do masquerading.
> >
> > The problem...
> >
> > Telnet/SSH connections to the machine, from the outside world,
> > disconnect after 5-10 minutes of inactivity.  For example, I can
> > have 3 SSH connections to my box, neglect one window for a few
> > minutes, and when I go to that window and start typing, I get a
> > message from PuTTY saying I got disconnected.
> >
> > I've looked extensivly on the net trying to figure out what's wrong
> > and how to fix it.  I've come across a couple sites saying that
> > this could possibly be caused by a 'NAT teardown'.  I'm new to
> > iptables and NAT, so i'm not exactly sure what this means.  I was
> > under the impression that NAT timeouts on CONNECTED connections was
> > like 5 days of inactivity before it would drop.  When I cat
> > /proc/net/ip_conntrack, i see my connections, and I see they have
> > very high timeouts.
> >
> > I've looked through the iptables man page, as well as the
> > iptables/netfilter website, and i can't find anything relevent to
> > this.  Does anyone know how I might fix this?
> >
> > -Jeremy
> > 
> 
> 
> Have you tried:
> 
> using an application other than Putty? 

Yes, same problem

> from another machine? 

Yes, same problem.

> connecting in the opposite direction?

Yes, this is not a problem with outbound connections, only inbound.

> watching the connection via tcpdump?

No, I'm not familiar enough with tcpdump's syntax to know what to look for. 
What command line options should I use?

> 
> These may help to see what's going on.
> 
> Regards, Mike Klinke
> 
> 
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