jpetazzo/pipework — pull request #100 by ey3ball (2014-11-09 11:45:40+00:00)
Title: Add a route to the gateway when hosted on a different subnet

use case: a number of dedicated server providers offer failover
ips. In that case the gateway that needs to be used is derived from
the server main ip address which is usually hosted on another subnet.

see for instance (section 2.4) :
http://forum.online.net/index.php?/topic/4437-all-about-failover-ips-beginners-guide/