Hello pals!
Here is my strange problem....
I've recently configured my fedora 2 box to work as a gateway to my "treacherous" father's windows xp box. Now I have a really messy thing happening. When I try to "startx" the Xserver, with the iptables definition script I've made activated, it crashes , doesn't enter, and, if I deactivate the script, it runs normaly, whitout problems. Please can anyone say what is wrong with it, here it is (I use eth0 for acessing the internet and eth1 for the LAN):

#!/bin/sh
PATH=/sbin:$PATH

iptables -X
iptables -F
iptables -t nat -F
iptables -P FORWARD ACCEPT
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT

iptables -A INPUT -j LOG -s 192.168.0.0/24 -i eth1
iptables -A INPUT -j LOG -s localhost/8 -i lo
iptables -A INPUT -j DROP -s 192.168.0.0/24 -i eth1
iptables -A INPUT -j DROP -s localhost/8 -i lo

iptables -A INPUT -j ACCEPT -i eth1
iptables -A INPUT -j ACCEPT -i lo

iptables -A INPUT -j ACCEPT -p tcp --dport 22

iptables -A INPUT -j ACCEPT -p tcp --dport 6000

iptables -A INPUT -j ACCEPT -p tcp --dport 1024: ! --syn

iptables -A INPUT -j ACCEPT -p udp -s 213.228.128.6 --sport 53 --dport 1024:
iptables -A INPUT -j ACCEPT -p udp -s 213.228.128.5 --sport 53 --dport 1024:

iptables -A INPUT -j ACCEPT -p icmp --icmp-type 0
iptables -A INPUT -j ACCEPT -p icmp --icmp-type 3

iptables -A INPUT -j LOG
iptables -A INPUT -j DROP

iptables -t nat -A POSTROUTING -j MASQUERADE -s 192.168.0.0/24 -d ! 192.168.0.0/24

Very messy. One of the first problems is your INPUT -j DROP should be the first thing, that way you close everything down, then you open the things you want to open.

http://www.technoslave.net/other/iptables.txt

Here's what my iptables looked like a while ago. It has the NATing and the Masquerading and whatever else you'll need.

You may not need this rule. For other INPUT rules consider using -i.

Thankyou guys... But I've solved my problem with firestarter.... nice graphic firewall configuring util. Maybe I'm just too lazy to use brute text modes .