Sub-domains or other hosts… fourth-level hostnames

[aven]

I have a pFSense box configured with dyndns; so I have xxx.dyndns.org. It works fine to access, all ports forward correctly.

Is it possible to have a.xxx.dyndns.org point to another server I have on the network?

Example; I have 2 internal servers that have both SSH and HTTP servers. And, on the account that pFSense has an https connection, it would be easier to choose http://a.mydomain.dyndns.org for server A, and http://b.mydomain.dyndns.org for server B… etc. etc.

Of course, I could do all this through port forwarding, and assign different ports to different servers... But that is sloppy.

I'm currently working on trying to get an Ubuntu server box as a subdomain...

the hostname apparently is server1.xxx.dyndns.org, and hostname fqdn is xxx.dyndns.org

I dunno, I'm somewhat stuck. And because I don't know what exactly to call this issue, I can't find much information on Google about it.

Thanks!

--Aaron