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I updated my router to OpenWRT BackFire yesterday. As I use OpenDNS and dyndns.org, I use DNS-O-Matic for updating both at the same time. Sadly this service is not known by most routers out of the box. But it was very easy to add it to OpenWRT. All you need is the luci-apps-ddns module and add a custom ddns account.

Most settings are straight forward: username, password... The tricky one is the Update-URL:

http://[USERNAME]:[PASSWORD]@updates.dnsomatic.com/nic/update?hostname=[DOMAIN]&myip=[IP]&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG

Simply paste that in that field. The ddns update script will replace those variables. As you want to update all at once, there is the special hostname all.dnsomatic.com that will do that for you.