@ISP-Engineer Hi, thanks for posting question here. May I know who is your ISP? As we know, TP-Link products are compatible with most ISPs in your region.

@Midori Hi, thanks for posting question here. Does your SIM card provide IPv6 service? You may refer to the screenshot below and go to the Web UI of the router to change PDP Type as IPv4.

@brandy316 Hi, thanks for posting question here. It is suggested to follow this guide to troubleshoot~

@Tadiern_80 Hi, thanks for posting question here. As we can see on the official website, Archer VR1210v is a customized model by some local ISPs. It is a pity that we can know much less than common...

@Barry788 Hi, thanks for posting question here. VX230v is customized model by some local ISPs. It is a pity that we can know much less than common DSL modem routers. If you failed to find certain...

@barney45 Hi, thanks for posting question here. May I confirm what is your exact network topology? Do you have another PC to check? You may share your VPN configuration file here for our analysis. It...