VPS Ubuntu 10.10 config (4) iptables

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Leic

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(1)   Enable IP forwarding in linux    

   echo 1 > /proc/sys/net/ipv4/ip_forward

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

 

(2)  Enable NAT for the subnet of OpenVPN

   sudo iptables -t nat -A POSTROUTING -s 10.168.100.0/24 -o eth0  -j MASQUERADE
   sudo iptables -t nat -A POSTROUTING -s 10.168.200.0/24 -o eth0  -j MASQUERADE

 

(3) Keep iptables

 sudo bash -c "iptables-save > /etc/iptables.rules"

 

(4) Auto start on boot by add the following lines into /etc/network/interfaces:

auto eth0
iface eth0 inet XXXX
  pre-up iptables-restore < /etc/iptables.rules