[afnog] Linux Port Forwarding

[Eliufoo C. Mahinda]

Hi,

I have been having problem setting up portforwarding
on my linux box. I have two interfaces configured
(Internet & LAN). I want traffic from a specefic host
to be routed to a specific server.

My external interface is eth1 (197.41.39.55) &
internal interface eth0 (192.168.10.0/24) that has
several servers and networking equipments that needs
to be reached by external hosts. I intend to route
traffic from host 80.223.75.169 destined197.41.39.55
on port 8080, to be forwarded to 192.168.10.5 port 80.
According to my internet search, below configuration
should work:


- iptables -t nat -A PREROUTING -p tcp -i eth1 -d
197.41.39.55 --dport 8080 -j DNAT --to 192.168.10.5
- iptables -A FORWARD -p tcp -i eth0 -d 192.168.10.5
--dport 80 -j ACCEPT
- iptables -t nat -A PREROUTING -j LOG --log-level
debug --log-prefix '***PREROUTING***'

I have implemented the above configuration but nothing
works. I have also completely FLUSHED my firewall (for
testing) and loaded the NAT module. And still doesn't
work. Also, apart from the log file (messages), how
can i troubleshoot iptable configuration.

Assist please:

Elly


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