Thanks Marian,
The server only has one IP. I think I should add more iptables records, only one NAT record is not enough,isit correct? If yes , then how?
2011-06-26 23:38:58，"Marian Marinov" <mm@xxxxxxxx> wrote：
>On Sunday 26 June 2011 12:53:07 muiz wrote:
>> Dear all,
>> I would like to forward a port to an internet server, but failed. can you
>> help me? Server: eth0: 192.168.1.250, Port: 8080 TCP, CentOS 5.6
>> Remote server: IP: a.b.c.d Port: 8181
>>
>>
>> Forward path: client1(192.168.1.10) -> 192.168.1.250:8080 (forward) ->
>> a.b.c.d Port: 8181 -----------------------------------------
>> In Fedora, I successfully to config the firewall using
>> system-config-firewall and iptables command: 1. Run system-config-firewall
>> 1.1 open local port 8080
>> 1.2 add a forward rule: local 8080 to remote a.b.c.d:8181, tcp
>> 2. echo 1 > /proc/sys/net/ipv4/ip_foward
>> 3. add a iptables rule: /sbin/iptables -t nat -A POSTROUTING -d a.b.c.d -p
>> tcp --dport 8181 -j MASQUERADE That's all.
>>
>>
>>
>>
>> Thanks !
>You have to use Destination NAT for the job:
>
>iptables -t nat -A PREROUTING -j DNAT -p tcp --dport 8080 --to a.b.c.d:8181
>echo 1 > /proc/sys/net/ipv4/ip_foward
>
>If you have more then one IPs on the local machine its a good idea to specify
>the destination -d 192.168.1.250
>
>Marian
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