Iptables newbie

[Christian Saalborn <christian.saalborn@inxnet.de>]

Hello,
has a newbie to iptables I have some problems. I have a dsl-router which 
is also my firewall. In my lan I want to host a game ( e.g. megamek ). 
This game needs port 2346. So I thought the script I appended below 
should work. The next thing is that my firewall didn't log the messages. 
I get no message from the firewall if somebody want to connect to my 
server and he is rejected. UDP messages or ICMP messages or other TCP 
messages are logged. I run woody with 2.4 kernel same goes for the lan 
machines.

Thanks in advance,

Christian


The script:

#!/bin/bash

UPLINK="ppp0"

INTERFACES="lo ppp0 eth1"

iptables -P INPUT DROP
iptables -A INPUT -i ! ${UPLINK} -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -A INPUT -p tcp --dport 2346 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -p tcp -o ${UPLINK} -m state --state
NEW,ESTABLISHED -j ACCEPT

if [ -e /proc/sys/net/ipv4/tcp_ecn ]
then
        echo 0 > /proc/sys/net/ipv4/tcp_ecn
fi

for x in ${INTERFACES}
do
        echo 1 > /proc/sys/net/ipv4/conf/${x}/rp_filter
done

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ${UPLINK} -j MASQUERADE

iptables -A INPUT  -i ${UPLINK} -p tcp -j LOG --log-prefix "IPTABLES
TCP-IN: "
iptables -A OUTPUT -o ${UPLINK} -p tcp -j LOG --log-prefix "IPTABLES
TCP-OUT: "
iptables -A INPUT  -i ${UPLINK} -j LOG --log-prefix "IPTABLES
PROTOCOL-X-IN: "
iptables -A OUTPUT -o ${UPLINK} -j LOG --log-prefix "IPTABLES
PROTOCOL-X-OUT: "

iptables -A INPUT -p tcp -i ${UPLINK} -j REJECT --reject-with tcp-reset
iptables -A INPUT -p udp -i ${UPLINK} -j REJECT --reject-with
icmp-port-unreachable