EdgeRouter X DDNS with Gandi

I recently setup a VPN for my home network. To make use of it from remote networks I need to be able to resolve the public IP of my router. Instead of hard coding the IP I setup an domain with Gandi and created an A Record that I update from my router.

Fetching and reporting your IP

This part was fairly easy. With a quick search I found that somebody else had already solved the problem of reporting the public IP from an Ubiquiti router to Gandi! Checkout their work here. Their README provides a nice easy walk through of the setup.

Scheduling it

With the above script updated and working on my router the next thing to do was schedule it.

*Quick note only specific directories persist between firmware updates on the EdgeRouter. Because of this I suggest putting the script above in config/scripts/ or config/user-data.*The EdgeRouter OS provides a helper utility called task-scheduler which wraps cron. The benefit of task-schedule is that is saves our commands to config so they persist through upgrades. ssh into your router:

ssh <user>@<router>
configure
set system task-scheduler task ddnsupdate
set system task-scheduler task ddnsupdate crontab-spec '0 5 * * 0'
set system task-scheduler task ddnsupdate executable path '/config/user-data/'
commit
save
cat /etc/cron.d/vyatta-crontab