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Old 03-02-2004, 09:58 AM   #1
philipina
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Registered: May 2003
Posts: 77

Rep: Reputation: 15
Unhappy Port forwarding with iptables is not working?!!


Hello,

I have a problem with iptables port forwarding.
I read a lot of documents and questions about that.
I also checked everything about that in the forum but it's nerver work.
I would like to forward all data from 10.1.1.53:1240 to 10.1.1.240:9000.

I'm using redhat 9.

I added some rules with a script :

/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d 10.1.1.53 --dport 1240 -j DNAT --to 10.1.1.240:9000
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 10.1.1.240 --dport 9000 -j ACCEPT

and I modified the file /etc/sysctl.conf --> # Controls IP packet forwarding
net.ipv4.ip_forward = 1

After restarting the network and iptables I have the following status.

[root@localhost init.d]# ./iptables status
Table: nat
Chain PREROUTING (policy ACCEPT)
target prot opt source destination
DNAT tcp -- anywhere 10.1.1.53 tcp dpt:1240 to:10.1.1.240:9000

Chain POSTROUTING (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Table: filter
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere 10.1.1.240 tcp dpt:9000

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

But the IP forwarding is not working.
I also tried a lot of different configurations.
Where is the problem?
I'm going to become crazy!!!

Thanks a lot in advance for your help.

Alain.
 
Old 04-03-2004, 03:18 PM   #2
evil1
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Registered: Apr 2004
Posts: 5

Rep: Reputation: 0
use
/sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d 10.1.1.53 --dport 1240 -j DNAT --to 10.1.1.53:9000
/sbin/iptables -A FORWARD -p tcp -i eth0 -d 10.1.1.53 --dport 9000 -j ACCEPT
 
  


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