Comment 4 for bug 702802

One potential solution is to put a script in /etc/network/if-up.d that executes before any of the other scripts in that directory and waits for a specific condition (e.g. an IP address is assigned, or a route becomes available). I posted an example here: http://askubuntu.com/questions/194632/how-do-i-delay-upstarts-net-device-up-signal-until-a-condition-is-met