@dennisr40 If your TL-WR841N doesn't show the public IP address, then I see two possible scenarios. 1) Your Internet Service Provider is routing your Internet connection through another NAT router on...

@dennisr40 Hi, Check if your WR841N has the setting "Forbid Ping Packet From WAN Port". If it has that option, then you need to disable it. Furthermore, is the "public WAN IP Address" you mentioned...

@woozle Ok, I herewith revoke the "all" from my previous post. At least the Archer MR600 V3 seems to support configuation of the IPv6 firewall. (see attached screenshot) I wonder which other models...

@SteinQuattro Hi, It basically tells you on the second screenshot. "Please go to the web management page to unlock your SIM card." You can access the web management page via any Internet web browser...

@TheCate Hi, Apparently, at present all TP-Link routers that support IPv6 have the IPv6 firewall enabled by default, without any provisions to either configure it (open ports) or to disable it...

@Ollie_ To rule out some parts of the chain from the Internet to your Ubuntu Server maybe try if you can at least get as far as the C6 itself. Either setup a VPN Server on the C6 and then connect to...