I recently switched some of my domains to Joker.com. One of the nice things Joker has is capability to dynamically update DNS records. I was going to use ez-ipupdate, but my OpenWRT router did not have enough free memory to install the package.

It rummaging through FAQ on Joker website it turns out I can update entries using wget in a cron job as well. All it takes is to set up cron entry that looks something like this:

0 * * * * wget "http://svc.joker.com/nic/update?username=BLAH&password=BLAH&hostname=myhost.example.com" > /dev/null 2>&1

Username and password are supplied by Joker when setting up DDNS.