DynDNS accounts do not and cannot send packets.
You have the DDNS update client enabled on 192.168.1.203 which raises HTTP requests to checkip.dyndns.com (18.104.22.168, 22.214.171.124, 126.96.36.199), probably every 10 minutes, to see if your IP address has changed. What your router log shows are the responses to these requests. No idea about the reference to 2012, but network traffic is supposed to be current.
I suggest you ignore this stupid router message, or to change the rule which causes this output. Also disabling the DDNS update client on 192.168.1.203 should help if you don't need it anymore.