Two Routers, One Confused Network: Untangling Double NAT on a UK IPTV Setup
Stacking your own router behind a Virgin Hub, BT Smart Hub or Sky box is a classic UK upgrade move — and a classic way to quietly break Plex, remote access and the odd catch-up app. Here is how double NAT happens, which ISPs let you fix it properly, and how to back out safely if it all goes wrong on a Sunday night.