telnet/ssh disconnects... Possible NAT teardown?
Jeremy
irwinr12 at yahoo.com
Thu Feb 5 22:49:07 UTC 2004
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
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