Hello, I was unable to find any information in the forums on this topic, so I thought I'd post what I'm doing. Basically I'm migrating a Plesk server from one physical sub-net to another on a completely different switch and sub-net. The switches are physically close enough that I can use both Eth cards on the Plesk server to allow access to both subnets at the same time. The reason for this is to limit downtime during the migration as some visitors may have the old (DNS) address cached. There are two obstacles to overcome. 1) Setting up Linux to be Multihoned 2) Setting up Plesk to use both IP's I'm not entirely finished trying #2 yet, but it seems to be working. --- Here's what I've done ----- 1) Setup Linux to be Mulit-honed Code:a) edit /etc/sysconfig/network-scripts/ ifcfg-eth0 & ifcfg-eth1 Assuming you're migrating to the subnet on eth1, eth1 will be your primary outbound interface.Code:b) add the following two lines to /etc/iproute2/rt_tables 200 T1 201 T2Code:c) setup the following file to run at startup. ensure UPPERCASE variables are replaced by the correct information. /etc/rc.d/init.d/iproute #!/bin/sh ip route add NEW_IP_NET dev eth1 src NEW_IP_ADDR table T1 ip route add default via NEW_IP_GATEWAY table T1 ip route add OLD_IP_NET dev eth0 src OLD_IP_ADDR table T2 ip route add default via OLD_IP_GATEWAY table T2 ip route add NEW_IP_NET dev eth1 src NEW_IP_ADDR ip route add OLD_IP_NET dev eth0 src OLD_IP_ADDR ip route del default via OLD_IP_GATEWAY ip route add default via NEW_IP_GATEWAY ip rule add from NEW_IP_ADDR table T1 ip rule add from OLD_IP_ADDR table T2Code:d) Run (service network restart)Code:e) Run (/etc/rc.d/init.d/iproute)2) Setting up Plesk to use both IP's I couldn't locate anywhere within plesk to change the IP address of the Virtual/Shared Hosts to use the new IP/Interface. Someone please correct me if there is a way to do this. Code:a) You need to edit the files located at... /var/www/vhosts/SITENAME/conf/httpd.include Duplicate all of the references in the VirtualHost area and reference the new IP Address for the duplicated section.Code:b) Run (service restart httpd)Hope this helps if anyone is looking to do the same thing. And if I've done something that's incompatible with Plesk, please speak up.