Dynamic DNS issue

This is more of a how-to question than anything else. Basically, I have
two consumer xDSL lines at different locations that I want to be able to
have the computers find each other. The DSL lines are PPPoE with
dynamicly assigned IP addresses. The only thing that is constant is the
hostnames which are registered with a dynamic DNS service and are
available across the internet.

Now my question is how to I setup the servers at each location so that
they update each other's DNS information?


--
Daniel Rudy

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