interface| routing] [ pre| up| down| post] arguments... Modifies interface characteristics ( interface) or the routing table ( routing) either before ( pre) the link comes up, when it is up, when it goes down, or after ( post) the link is shutdown. For example: config up routing add canary gw ibis adds a route to canary using ibis as the gateway when the link is up. Allowing users to modify the routing table or interface characteristics is very dangerous. The config command is disabled in the DIP code and requires re-compilation to be enabled.