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today I able to migrate some of the game servers to another server and needed some help to redirect the traffic from old ip to the new one.

SERVER1 1.1.1.1 ----- (internet ) -----> SERVER 2.2.2.2

I asume to use iptables to perform this, for that used this rule on my centOS box in the server1.

/etc/sysctl.conf: net.ipv4.ip_forward = 1

iptables -t nat -A PREROUTING -p udp --dest 1.1.1.1 --dport 27015 -j DNAT --to-destination 2.2.2.2:27015
iptables -t nat -A POSTROUTING -j MASQUERADE
iptables -t nat -A POSTROUTING -d 2.2.2.2 -p udp --dport 27015 -j SNAT --to 1.1.1.1

But the client cannot connect to the server from the old ip, the redirection don't started.

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2 Answers 2

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You could do something along these lines:

iptables -t nat -A OUTPUT -p all -d 1.1.1.1 -j DNAT --to-destination 2.2.2.2 
iptables -t nat -A POSTROUTING -p all -j MASQUERADE
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If you didn't have any NAT configured previously on this server, you may not have the kernel set to pass IPv4 traffic.

Make sure you have this in your /etc/sysctl.conf:

net.ipv4.ip_forward = 1
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1  
ip forwarding is enabled, but I have the same problem. –  Kiwi Aug 28 '12 at 22:37

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