Shared hosting server + NAT + virtualhosts reachability

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How to make virtualhosts visible to each other on a shared hosting server behind a Firewall.

Situation

You have a web hosting server with lots of virtual hosts running on it.
You also have a a firewall in front of the server.
The server has a private IP address assigned to the NIC of the server and the firewall provide a NAT (public_ip -> private_ip)

Problem

Some virtualhosts on the server need to connect to the public DNS name of a virtualhost on the same server.
The DNS resolution resolve the DNS name to the public IP of the server and according to the routing table the traffic is routed to the firewall that make the connection impossible for a "in-out-interface-problem".

Solution

I think that there are more than one solution:

  1. alias the public ip
  2. nat in OUTPUT chain

I prefer the iptables solution and this worked for me:

ETH0_IP=$(ifconfig eth0 | grep "inet addr" | awk '{print $2}' | awk 'BEGIN {FS=":"} {print $2}')
ETH0_IP_PUBLIC="YOUR.PUBLIC.IP.ADDRESS"
$IPTABLES -t nat -A OUTPUT -d $ETH0_IP_PUBLIC -j DNAT --to-destination $ETH0_IP

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