Outgoing traffic from domain with dedicated IP
I'm curently on a dedicated server with 3 IPs on one NIC. one of the clients requested a Dedicated IP (for purposes like Getting files from sites like Rapidshare and using the Google's Search API). I assigned his domain the IP address and everything is working as expected and he can access his site through the IP. But the outgoing traffic (initiated) from that domain still uses the server's main IP (as opposed to the client's dedicated IP). how can I make that specific domain do all of its outgoing traffic on the dedicated IP address.
eth0 91.xxx.xxx.xxx --> main server IP
eth0:0 79.xxx.xxx.xxx --> this is the IP dedicated to the customer.
Server is running on CentOS 5.
Any help is greatly appreciated.