I have come up against the first instance of DynDNS failing its purpose.
Setup: Cox cable broadband, generic Motorola modem (10.1.10.1 lan) , Linksys wireless router (10.1.10.50 wan, 192.168.1.1 lan), then workstations.
I want to access the FTP server on one of the workstations via DynDNS, so I set up the Linksys router with my DynDNS account.
Problem: instead of reporting my actual IP address at the school, i.e. 188.8.131.52, it actually reports its own wan address, 10.1.10.50. Obviously if I try to access my FTP server with the hard IP it works, and if I tru to use mydomain.dyndns.org, it doesn't.
How can I fix it?