What is double NAT?
Double NAT occurs when two routers both perform routing/NAT. It can affect gaming, inbound access, VPNs and discovery. Use one routing layer where possible.
WAN private IP; two DHCP servers; topology.
Network engineering.
Show the technical detail
On a managed Wi-Fi plan
Prefer upstream modem/ONT bridge or eero bridge only after checking feature trade-offs.
On another provider's router
Use provider-supported modem/bridge mode.
What to be careful of
Bridge mode may disable security/parental features; explain before change.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026