<https://www.snbforums.com/threads/remote-connection-with-cg-nat.91859/>
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"Setup is an Asus ZEN WIFi AX Hybrid connected to City Fibre in UK and a Huawei B535-333 4G VOLTE connected to the Free Mobile network in France. In France I have cameras, smart plugs and central heating controller all connected by WiFi and I can connect to them from anywhere. What I can’t do is connect the two LAN’s with a VPN. I understand the issue is caused by CG-NAT at the French end. What is iit that allows me to access devices such as smart plugs on both LANs but prevents me from connecting a VPN?"
<https://www.snbforums.com/threads/remote-connection-with-cg-nat.91859/>