Weird: eth0->adsl link becomes slow after 1 week running

users_at_linuxforums.org
Date: 04/29/04 

Date: Thu, 29 Apr 2004 22:25:52 +0100

Hi there,

This is a very weird issue and took me a long time to realize that was
happening.

It seems that, when the system is up for more than aprox. 8 days, the
outside interface (eth0->adsl) suddenly becomes terribly slow,
until I restart the system. If I restart just the interface, it
solves the problem for about 2 min, and then goes slow again (icmp
replies from a near website decreases from 30ms to 2000ms in less
than 1 min), even when the network is idle (empty nat/forward table
and no packets going through eth0 or eth1). I tried almost
everything, and I am preety sure its an internal issue (not
adsl->isp), since tcpdump shows that the outgoing packets are
actually taking some time to leave eth0 and hit the modem (the
replies from the 'outside world' (adsl->eth0) are actually preety
fast). I also tried renewing the lease, restarting the modem,
restarting the whole network (same results as restarting just the
interface), flushing/reloading firewall rules, setting very short
masquerading timeouts, and many other things, but I just can't figure
what is going on, or where, why, how.

Right now the only "solution" I have is to reboot the system weekly
from a cron job, but this is just very pfffffffff.....

Note that, everything runs perfectly, until the system is up for more
than 1 week.
Then the issue occurs, and is only solved when the system is
restarted.

I1m running rh6 on a small network gateway, eth1=lan, eth0=internet.
Any ideas? 

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