# Adding a backup Internet WAN on my OPNsense Router

DevFeed: [Adding a backup Internet WAN on my OPNsense Router](<https://devfeed.tech/articles/adding-a-backup-internet-wan-on-my-opnsense-router-10477.md>)

Original publisher: [Read original article](<https://www.jeffgeerling.com/blog/2026/opnsense-backup-internet-gateway/>)

Author: jeff@jeffgeerling.com (Jeff Geerling)

Published: 2026-07-23T21:00:00Z

Content type: tutorial

Language: en

Sources: [Jeff Geerling](<https://devfeed.tech/sources/jeff-geerling.md>)

Topics: [Firewall](<https://devfeed.tech/topics/firewall.md>), [networking](<https://devfeed.tech/topics/networking.md>), [configuration](<https://devfeed.tech/topics/configuration.md>), [5G](<https://devfeed.tech/topics/5g.md>), [Software](<https://devfeed.tech/topics/software.md>)

Tags: [5g](<https://devfeed.tech/tags/5g.md>), [backup](<https://devfeed.tech/tags/backup.md>), [ethernet](<https://devfeed.tech/tags/ethernet.md>), [firewall](<https://devfeed.tech/tags/firewall.md>), [internet](<https://devfeed.tech/tags/internet.md>), [networking](<https://devfeed.tech/tags/networking.md>), [opnsense](<https://devfeed.tech/tags/opnsense.md>), [outage](<https://devfeed.tech/tags/outage.md>), [router](<https://devfeed.tech/tags/router.md>)

## AI overview

A practical guide to adding a portable 5G gateway as a backup WAN on an OPNsense router. It covers assigning a second Ethernet interface, configuring DHCP and outbound NAT, and manually changing gateway priorities to fail over between connections.

## Source excerpt

AKA "Spectrum has gone down two weeks in a row and I'm sick of it". I've been borrowing a portable 5G gateway from my Dad for a few weeks, for testing... and two weeks in a row, I've used it as a backup Internet option, since my Spectrum Business cable Internet has gone down. And yes, I'd get AT&T Fiber if I had the option, sadly they don't yet provide service at my studio. So I'm stuck with only one high speed wired provider. I may add on my own 5G backup Internet connection in the future, but we're getting off track.