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I have a few servers on which I run nameserver trough webmin/bind. Now I have a computer at home that I want to access from anywhere in the world, the only problem is, my IP adress changes often.
Ideally I want to create a name, for example, myhomepc.mydomain.com, which always points to my IP adress.
This means that the A record of this domain has to change according to my IP adress.
Is this possible? I am doing my work trough webmin.
The absolutely easiest solution is to use one of the free dynamic DNS services like dyndns.com or no-ip.com (Google for more options).
If you need to have your home pc on your "mydomain.com", I suggest using a CNAME pointing to the dyndns fqdn.
If you run your own bind server, have a look at proper Dynamic DNS rather than options like dyndns and no-ip.com. This uses features available as standard in Bind to update the zone directly. It's a bit more involved than setting up a CNAME for one of the above services, but at least you have full control.
There's a webmin module that will seemingly handle is here, although I haven't used it, so don't know how good it is.
For details on how to set it up manually, you can have a look here.
If you already have a host somewhere for yourdomain.com, they usually provide a dynamic dns feature in the toolset. I know bluehost does (because i actually do what you are trying to do). It works great, and if you are behind a router, just a simple NAT with a port forwarding rule in your router and you are all set with yourmachine.yourdomain.com.
I know you said your IP changes a lot, but if your machine is on all the time, it shouldn't change, but i don't know that much information about your setup.
