Through a miscue I lost the iptables setup that came with Fedora 9. I
created a new set of rules and decided that I would restrict OUTPUT
chains instead of allowing anything to go as the Fedora firewall does.
I kept an eye on the logs and added services that were used. Everything
was working fine. Then I decided to run a yum update .
It worked but I got a lot of two kinds of TCP packets logged.
One was SYN packets with random destination ports at the high end of the
range. I'm assuming this was something to do with passive FTP. Why
they should show up I'm not sure since I have FTP enabled and RELATED,
ESTABLISHED status ACCEPTed.
The second was packets to port 80 on the repository with flags ACK,
PSH, FIN. I've looked and looked but can't find why this combination is
being sent. Does anyone know what this is and what rule in iptables
would take care of it? I've come up with "$IPTABLES -A OUTPUT -p tcp
--dport 80 --tcp-options SYN,ACK,PSH,FIN ACK,PSH,FIN -j ACCEPT .
Why wouldn't this combination be accepted as RELATED, ESTABLISHED
already? Or is yum/urlgrabber/tcp sending this in error so I should
just drop it?
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