How can I update dynamic IP from pfsense box, using my own DNS server?

Ok, let me try to put this together. I have one pfsense box with one dynamic IP address, and on another location (other country) I'm running VPS with my DNS server (bind9).

So now, I want to make that dynamic IP from the pfsense box is updated whenever is renewed. Updated where? In my DNS server:

Suppose I have something like this:

pfsense.mydomain.bla.   IN  A   -my dynamic IP-

I never did this, so I don't have much experience with this kind of configuration and I know that I can use free dynamic dns service, but I want to try with my own DNS server.

So any solution for this?

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