weird tcp problem after install fc1

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I installed FC1 onto a machine that was previously running RH9. I 
formatted the partitions etc, only keeping /home, deleting the rest.

Configured everything to my liking (named/snmpd etc).

Everything went fine, the machine (my gateway) was routing packets 
properly, iptables did what it should and so on. I could ssh to the 
machine from my local XP box just fine.

Now, I proceeded to try to use yum to upgrade. It started and then nothing
happened (tried three diferent yum servers). I started doing tcpdump and
noticed there were about 10 packet per second going back and forth (small
packets). Noticed that trying to ssh to the FC1 box from the outside was
very slow. Connection established and then the key exchange took forever,
seemingly stuck. After a few minutes or so it would go to the next stage
in the handshake process. Dito with ftp to ftp servers, it would establish 
the tcp connection and then take 1-2 minutes to get the banner, which 
usually only takes 1-2 seconds).

Telnetting to port 21 (ftp) on an external box from the fc1 box yielded
the login prompt being "typed" one character at a time, approx 3-5
chars/second. All is constistant with TCP sending one character per
packet. UDP and ICMP worked just fine (ping 1400 byte packets and dns
resolving). It just seemed that TCP sessions going to and from the box was
doing one char per packet... TCP going thru the box (routed) was not
affected. TCP to FC1 from the XP box was not affected.

This has never happened to me in my 8 years of running linux (redhat since 
v3.0.3).

I tried some more troubleshooting (disabling iptables, removing the
iptables modules etc). Nothing worked.

I proceeded to reboot the machine and then everything was fine. Yum worked
and I see no problems at all now).

Anyone seen this before? I'm very puzzeled. Now after 2 more reboots after 
all the upgrades everything still works perfectly.

-- 
Mikael Abrahamsson    email: swmike@xxxxxxxxx





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