CGNAT means your internet provider shares one public IP across many homes. Here’s how to tell if you’re behind it, which providers use it (Starlink, T-Mobile, Verizon 5G Home), why your VPN router still works, and how to get around it for port forwarding and remote access.

Double NAT happens when your router sits behind your ISP’s gateway and both translate addresses. Here’s what it breaks (gaming, port forwarding, remote access), what it doesn’t (streaming and VPNs), and how to fix it.

A VPN can show connected while certain sites stall, logins fail or uploads freeze. Learn how an MTU mismatch creates a selective failure—and how to diagnose it without randomly changing router settings.

A cheap smart plug running years-old firmware can sit on the same network as the laptop you bank on. IoT isolation keeps one hacked gadget from reaching everything else — here’s the easy way and the thorough way to do it.

Your iPhone may appear under a new identity because Apple uses private Wi-Fi addresses. Learn the difference between Fixed, Rotating and Off—and how to keep router rules and parental controls attached to the right device.

A new Wi-Fi 7 router can expose old smart-home limitations. Learn how 2.4 GHz setup, WPA3 compatibility, band steering and network isolation affect older bulbs, plugs, cameras and speakers—and how to reconnect them without weakening the entire network.