Re: still can´t FORWARD tcp on 25 port to another destination...

["Stanislav Puffler DiS." <stanislav.puffler@seznam.cz>]

Stanislav Puffler DiS. wrote:

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


Couldn´t be a problem, that I don´t have any modules in kernel to 
forward these packets or make masquerade ? Is it possible to install 
iptables if I haven´t got any modules or functions compiled in kernel ?
Thank a lot. Stanley