On 4/13/06, Chris Hunt <cdhunt at gmail dot com> wrote:
> Free host address registration on DynDNS expires after 30 days if you
> have not re-registered your IP in that amount of time.  A typical
> broadband IP address does not change that often so dynamic DNS client
> does not try to register the IP address.  Please include an option to
> register the WAN IP address with DynDNS (or dynamic IP address service
> of choice) every X number of days regardless the last time the address
> changed.
>

ez-ipupdate, the dyndns client used in m0n0wall, already does this. 
I've had the same DHCP assigned IP for 2+ years now, though I still
keep a dyndns registration.  Mine is still fine after all this time.

-Chris