This article presents how to be able to migrate VPS a VE between different subnets in the network by using a dynamic routing protocol such as OSPF. An already working OSPF setup is mandatory, this article only shows the OpenVZ specifics.

Install the Quagga routing suite available on [http://www.quagga.net / the official website].For many distributions, a prebuilt package is available:

Under Debian you can simply use the package.: apt-get install quagga

Under Gentoo: emerge quagga</pre>apt-get Under Fedora: yum install quagga</pre>

In /etc/quagga/ospfd.conf configure the OSPF network and area in which is OpenVZ server will be and configure the redistribution of routes generated by the VPSVE.

redistribute kernel route-map only-vpsve

route-map only-vps ve permit 10

Once your OpenVZ server takes part in the OSPF network, you can easily use the ‘vzmigrate’ command to migrate a VPS VE between different subnet of the network and the IP of the VPS VE will be redistributed in the whole network as a /32 (host route).

To avoid problems with this setup the IP addresses of your VPS VE must be taken outside of any other subnet configured on your network. If the IP address of the VPS VE is taken from an actual subnet, the other hosts of the subnet won't be able to communicate with it, except if you use proxy arp on the router.