[ubuntu] BIND (server) and Dynamic DNS Updates

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http://ubuntuforums.org – Hi, I'm trying to find information (step by step guide) or even if it's possible to update my DNS server dynamically! My scenario is that I host my own DNS server for my own domain in the cloud (ubuntu 8.04.4 LTS) which also hosts my web site, email forwarding, etc, etc. I'd like to be able to get my router or my ubuntu server at home (on the end of a DSL line behind a dynamic IP address) to update my DNS server with the current IP address of my home connection, creating an domain something like home.mydomain.com. I've done some searching but can only find results related to DHCP updates or (Hardware)