How do I change my subnet mask on a Linux cloud server? [closed]

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http://stackoverflow.com – I have a web app that is hosted on Linux cloud servers (Linode, specifically). I am working with a new client that needs to set up a VPN tunnel between their network and one of my main servers. For this reason, they said they needed a private IP and associate subnet mask, and this IP must be bound to eth0:0. So I used the Linode control panel to get a private IP and subnet mask, added the appropriate lines in /etc/network/interfaces and send them the info. The IP/subnet mask was: Then, their tech guys email me back, asking that I change the subnet mask to be at (HowTos)