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[vynce]

Here's a basic setup in pfSense:

• Go go Services and then Dynamic DNS.
  
• Check the "Enable" checkbox in the Dynamic DNS header.
    Service Type: DNS-O-Matic
    Hostname: all.dnsomatic.com
    MX: <leave blank>
    Wildcard: Check
    Username: <your DNS-O-Matic username>
    Password: <your DNS-O-Matic password>
  
• Click save.
  

See the DNS-O-Matic documentation for more details.

A DynDNS tip
If you have multiple hostnames mapped to the same IP address with DynDNS and you're using DNS-O-Matic to keep them up to date, list all of the hostnames as a comma-separated list in the host field of a single service entry in DNS-O-Matic. For example, create a single DynDNS service entry in DNS-O-Matic, enter your DynDNS username and password, and then your list of hosts: myhost1.homeip.net,myhost2.dyndns.net,myhost3.dyndns.net. I have found this to be much more reliable than creating a separate service entry for each hostname because it updates all of those hosts at once instead of one at a time. This is specific to the DynDNS update API.