I have just switched to TPG with the wireless broadband service.  The modem/router is a TP-Link VX420-G2h.  I have a Synology NAS on my home network, and want to be able to access it remotely, as I could on my previous service (NBN via HFC).  I have set up the required port forwarding, and the NAS has a reserved IP on the local network.  I have a DDNS set up with Synology so that a selected domain name can be used to access the NAS, by mapping it to the public IP address of the router.   BUT... although the Synology DDNS mechanism says it can communicate ok with the Synology server that manages this, the IP address that Synology determines is nothing like the public IP address shown by the router in its dashboard pages.  The IP address that Synology is showing appears to be one that is somewhere inside the Vodafone network (which is apparently the mobile network used by TPG for this service).  I have tried using the yougetsignal.com website, which also tells me that my external IP addess is the one reported by Synology.  But I repeat, it is NOT the external IP of my modem/router.  Anybody know what is going on here?  Is there a setting in the router that needs to be changed so that the DDNS will get correctly associated with the router's IP?  Or can this just not work in a wireless broadband environment? ... View more