Network topology

Bridge mode vs IP Passthrough: similar goal, different mechanics

Both are ways to use your own router behind provider equipment, but they are not synonyms. The difference matters when troubleshooting double NAT, provider support and managed services.

Page reviewed 28 September 2026Dataset snapshot 23 September 2026Cited sources 4How Hlonix verifies →

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Bridge modeProvider gateway stops routing; acts mainly as access/modem device

IP PassthroughGateway remains routing-capable but hands WAN address to one downstream device

Common bridge examplesXfinity, Rogers, Virgin modem mode

Common passthrough exampleAT&T BGW gateway

Bridge mode

A bridged gateway stops doing the normal home-router job. The downstream router receives the provider-side connection and becomes the main NAT/firewall/Wi-Fi device.

IP Passthrough

AT&T documents IP Passthrough as a way to share the gateway's dynamic WAN IP with one LAN device. The AT&T gateway remains active rather than becoming a transparent modem in the same sense.

Why both help with double NAT

The goal is to avoid two independent home routers doing NAT in series. But provider features, management access and failure modes differ, so the exact provider procedure still matters.

When AP mode is simpler

If you do not need your new router to own NAT/firewall functions, leaving the ISP gateway as router and using the new mesh in AP/bridge mode can be less fragile.

Next step

AT&T example Xfinity example Rogers example Run checker

Evidence

AT&T — IP Passthrough / DMZplus configuration (official ISP)
Xfinity — using your own router (official ISP)
Rogers — bridge mode with a third-party router (official ISP)
Virgin Media — Hub modem mode and reset guidance (official ISP)

Page reviewed 28 September 2026 · compatibility dataset snapshot 23 September 2026.