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Old 03-28-2011, 02:26 AM   #1
pnmanojshenoy
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Iptables Port forwarding


Hello,

I have set a rule in Iptables to do port forwarding to another Ip in

/sbin/iptables -t nat -A PREROUTING -p tcp -i eth+ -d 192.168.2.10 --dport 2200 -j DNAT --to 192.168.70.101:2200
/sbin/iptables -A FORWARD -p tcp -i eth1 -d 192.168.70.101 --dport 2200 -j ACCEPT

The redirect rule is working fine from other PC's but I am not able to do the same from the same machine in which I have configured the IPtables rule ie:

telnet localhost 2200 not working and also telnet 192.168.2.10 2200 not working from the machine whereas it redirection is working from from other PC's
 
Old 03-28-2011, 03:08 AM   #2
manyrootsofallevil
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Quote:
Originally Posted by pnmanojshenoy View Post
Hello,

I have set a rule in Iptables to do port forwarding to another Ip in

/sbin/iptables -t nat -A PREROUTING -p tcp -i eth+ -d 192.168.2.10 --dport 2200 -j DNAT --to 192.168.70.101:2200
/sbin/iptables -A FORWARD -p tcp -i eth1 -d 192.168.70.101 --dport 2200 -j ACCEPT

The redirect rule is working fine from other PC's but I am not able to do the same from the same machine in which I have configured the IPtables rule ie:

telnet localhost 2200 not working and also telnet 192.168.2.10 2200 not working from the machine whereas it redirection is working from from other PC's
What is the gateway for your PCs and what is the gateway for 192.168.2.10?
 
Old 03-28-2011, 04:08 AM   #3
pnmanojshenoy
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Hello,

Thank you for your reply, the Gateway for the PC and the IPtables Machine are the same. as I told redirection is working fine if I try from another machine. but I am not abke to do the same from the IPtables machine using localhost or the IP it tells connection refused.

0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 eth0
 
Old 03-28-2011, 04:38 AM   #4
manyrootsofallevil
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Quote:
Originally Posted by pnmanojshenoy View Post
Hello,

Thank you for your reply, the Gateway for the PC and the IPtables Machine are the same. as I told redirection is working fine if I try from another machine. but I am not abke to do the same from the IPtables machine using localhost or the IP it tells connection refused.

0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 eth0
My question was irrelevant, I was trying to replicate your setup but it had ipforwarding off. D'oh.

Have a look at this post http://www.linuxquestions.org/questi...-issue-487153/

In essence, you need the following

Code:
iptables -t nat -A OUTPUT -p tcp --dport 2200 -j DNAT --to 192.168.70.101
 
Old 03-29-2011, 12:03 AM   #5
pnmanojshenoy
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Hello,

I did check that before but was not working for me... but when I tried now it worked... had to flush Iptables two time, to get this worked..

iptables -t nat -F
iptables -F

Thank you.
 
  


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