From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Stanislav Puffler DiS." <stanislav.puffler@seznam.cz>
Subject: still =?ISO-8859-1?Q?can=B4t_FORWARD_tcp_on_25_port_?=
 =?ISO-8859-1?Q?to_another_destination=2E=2E=2E?=
Date: Fri, 12 Mar 2004 15:56:24 +0100
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To: Netfilter Mailing List <netfilter@lists.netfilter.org>

Hallo,
I can=B4t still FORWARD any incoming tcp packets (port 25) from Internet=20
coming to my external interface eth0 (82.142.67.253) to destination in=20
my network (192.168.200.2). Here is my complete ruleset from=20
iptables-save. I am 2 days without any idea or success :( Could anyone=20
help please ?

# Generated by iptables-save v1.2.6a on Fri Mar 12 14:53:44 2004
*nat
:PREROUTING ACCEPT [342:36496]
:POSTROUTING ACCEPT [42:3408]
:OUTPUT ACCEPT [66:5557]
-A PREROUTING -i eth2 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
-A PREROUTING -s 192.168.0.0/255.255.0.0 -i eth0 -j DROP
-A PREROUTING -s 172.16.0.0/255.240.0.0 -i eth0 -j DROP
-A PREROUTING -s 10.0.0.0/255.0.0.0 -i eth0 -j DROP
-A PREROUTING -i eth0 -p tcp -m tcp --dport 25 -j DNAT --to-destination=20
192.168.200.2:25
-A POSTROUTING -o eth0 -j MASQUERADE
COMMIT
# Completed on Fri Mar 12 14:53:44 2004
# Generated by iptables-save v1.2.6a on Fri Mar 12 14:53:44 2004
*filter
:INPUT DROP [83:8337]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
:spoofing - [0:0]
:syn_flood - [0:0]
:tcp_segmenty - [0:0]
:udp_pakety - [0:0]
-A INPUT -i eth0 -p tcp -j tcp_segmenty
-A INPUT -i eth0 -p udp -j udp_pakety
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 11 -j ACCEPT
-A INPUT -i eth1 -j ACCEPT
-A INPUT -i eth2 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 113 -j REJECT --reject-with=20
icmp-port-unreachable
-A INPUT -i eth0 -j spoofing
-A INPUT -i eth0 -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j syn_flood
-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 1/sec -j ACCEPT
-A INPUT -s 80.95.96.7 -i eth0 -j ACCEPT
-A INPUT -i eth1 -j ACCEPT
-A INPUT -i eth2 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A FORWARD -i eth1 -j ACCEPT
-A FORWARD -i eth2 -j ACCEPT
-A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -o eth1 -j ACCEPT
-A FORWARD -i eth0 -j spoofing
-A FORWARD -d 192.168.200.2 -i eth0 -p tcp -m tcp --dport 25 -m state=20
--state NEW,RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -s 127.0.0.1 -j ACCEPT
-A OUTPUT -s 192.168.0.1 -j ACCEPT
-A OUTPUT -s 192.168.200.1 -j ACCEPT
-A OUTPUT -s 82.142.67.253 -j ACCEPT
-A spoofing -s 192.168.0.0/255.255.0.0 -j DROP
-A spoofing -s 172.16.0.0/255.240.0.0 -j DROP
-A spoofing -s 10.0.0.0/255.0.0.0 -j DROP
-A syn_flood -m limit --limit 1/sec -j RETURN
-A syn_flood -j DROP
-A tcp_segmenty -p tcp -m tcp --dport 25 -j ACCEPT
-A tcp_segmenty -p tcp -m tcp --dport 80 -j ACCEPT
-A udp_pakety -p udp -m udp --dport 53 -j ACCEPT
COMMIT
# Completed on Fri Mar 12 14:53:44 2004

Thanks in advance,
Stanislav Puffler.