I currently have a RH 6.0 server with 2 NIC cards : one on a local
network and the other hooked up to a cable modem. I'm running IP
masquerading some my local network can have access to the net.
Everything runs fine for a couple of days. After about 5 days, we
notice that on _some_ machines of the local net, access to the
Internet slows down and then stops working (after about 1 day of slow
connection). About one day later, even the servers connection to the
net stops working (on the cable modem connection). A network restart
fixes the problem, but only temporarily. The only thing that works is
a complete reboot of the server.
I looked at ifconfig's info and there are no errors. I tcpdumped both
interfaces to see where the traffic was being blocked and it seems
that the packets are going out, but when they come back, they don't
seem to be able to _all_ go through the cable modem connection. When
this happens, ping works fine (packets are going in and out no prob).
Also, memory usage seems normal (no leaks).
Here is a little info on the server:
P133 64 megs RAM
Inet services: telnet, ftp, cvs, pop2 and pop3.
Server also running sendmail, inn, ypserv, httpd, mysql and samba.
eth0 : local net interface 10.10.10.1/255.255.255.0 (always works
eth1 : cable modem, DHCP server at my ISP