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Old 15th March 2007, 16:14
Tohubohu Tohubohu is offline
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Default IPtables slowing down my proftpd server.


I've been working on a new linux box with proftpd server and im at the point where I need to secure the server.

Iptables is set to block everything incoming and outgoing expect a few services like SSH INPUT, ICMP INPUT & OUTPUT, DNS OUTPUT and FTP INPUT

Here is the rule that seem to be causing problems:

-A INPUT -i eth0 -d -p tcp -m tcp --sport 1024:65535 --dport 21 -j ACCEPT

If ip tables tables is off, I get a prompt for a username in less then a second. When ip tables is turned on, it takes a good 5-10 seconds.

I also have 4 stateful rules:

-A INPUT -i eth0 -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i eth0 -p udp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -o eth0 -p udp -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -o eth0 -p tcp -m state --state RELATED,ESTABLISHED -j ACCEPT

Anyone ever encountered a smilar problem? Anyone has any idea of what can possibly be wrong in this case?

Many thanks!
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