Posted: Tue 10 Jan 2012, 08:47 Post subject:
How to configure Full Cone NAT using iptables ? Subject description: use iptables to configure Full NAT.
I want to find the right iptables commands combination to address the following need:
- NEs are NATed thru the linux box (using iptables) towards the WAN cloud, where the NTP servers are situated.
- In order to achieve redundancy, the NTP Servers are in a load balancing cluster with one virtual IP address (172.30.4.245)
- The problem is that when the NEs request for NTP updates using the 172.30.4.245, the NTP response is received from one of the actual IP addresses (.200, .230 .240).
The iptables is not allowing this flow, which is a normal behaviour since the requested vs responding address are not the same (172.30.4.245 vs 172.30.4.230) :
Request : UDP 10.68.2.11:23445 ---> 172.30.4.245:123 (this is Before NAT, of course after NAT the source is 10.23.14.72)
Response: UDP 172.30.4.230:123 ---> 10.23.14.72:23445 (Response to the WAN address)
I'm wondering if there is any way to let iptables establish the UDP flow only based on the (s-port/d-port) regardless of the IP addresses, and execute the NAT back to the LAN based on that.
UDP/NTP is just an example, almost all the needed services are setup in the same way (load balancing in Cluster).
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum