Many people focus mostly on the LAN ports at the back of the router. Meanwhile, the USB Port is often ignored or overlooked. It won’t be surprising if folks assume the USB port is meant for firmware recovery or phone charging. In reality, the router’s USB port is capable of so much more.

What you can do with it depends largely on the router’s model and firmware. If your router supports a powered USB hub, it can manage the power requirements of multiple USB devices. With the hardware you already own, the USB port can become a surprisingly useful building block for your home lab. Beyond basic networking, you can repurpose your router itself as a part of your home lab without spending extra money.

Running a VPN server with persistent logging

Requires compatible hardware and firmware

Most consumer-grade routers support VPN passthrough, allowing devices to establish secure VPN connections through the router's firewall, even with NAT. Stock firmware for certain models packs PPTP or OpenVPN support, while custom firmware like AsusWrt-Merlin, DD-WRT, Tomato, or OpenWrt enable far more robust VPN server setups.

With the USB storage device attached, you can set up persistent logging for troubleshooting and auditing, rather than relying on your router’s memory. That said, running a VPN server on a router requires compatible hardware, which includes adequate RAM. The configuration is entirely manual. Only a limited number of routers can run a WireGuard server continuously without performance issues. If your primary router isn’t up for that task, you can set up a WireGuard server on a mini PC or build a small travel router to use alongside your main router.

USB-backed DNS filtering

Custom firmware necessary

To block ads, trackers, and malicious websites, you can run DNS filtering software directly on the router. That requires a custom firmware capable of running DNS filtering services such as dnsmasq or unbound to work with text-based blocklists. In this setup, the router acts as an authoritative DNS forwarder for all the connected devices. You can plug a USB storage to save blocklists, configuration files, and DNS cache data, reducing the burden on your router’s flash memory.

Among the custom firmware, OpenWrt offers the most flexibility and granular control, but it also requires a powerful CPU to function properly. If a custom firmware doesn’t sound appealing, a simpler workaround is to plug a Raspberry Pi Zero 2W running Pi-hole into the router’s USB port for local DNS filtering.

Running a personal cloud server

Needs a powerful router

Running Nextcloud directly on your router requires high-end firmware. You’ll need at least 1GB of RAM to run a Turris OS (MOX) build, an OpenWrt-based distribution that supports Nextcloud. Otherwise, the PHP runtime and database backend will often crash, leading to an unreliable experience.

Routers with 2GB of RAM, a powerful CPU, and compatibility with Turris Omnia NG can handle Nextcloud well. Still, it’s more of an experiment worth trying and later migrating to a proper home server.

Build a casual NAS server

Modest speeds with open access

Many consumer-grade routers from major brands include basic file-sharing functionality in their stock firmware, enabling basic NAS features. Plug in a USB drive, HDD, or SSD, and you can access its files from a phone, tablet, or computer over the local network.

Most routers support USB storage with the FAT32 and NTFS file systems via SMB/CIFS. You’ll need to manually enable and configure the file-sharing features in the router’s admin interface.

But these features have limitations. Advanced permission controls, multiple user accounts, and elaborate access rules aren’t available in the stock firmware. The throughput performance is modest at best, making this setup suitable for light sharing rather than large file backups or heavy tasks like media editing.

Setting up a media server

Convenient streaming

Besides file sharing, most modern routers support DLNA or UPnP media sharing. This allows you to easily stream videos, audio, and pictures directly from the USB storage attached to the router without running a separate, dedicated machine. Smart TVs, game consoles, and streaming boxes automatically detect the router’s media storage. After configuring, streaming media becomes a breeze on the home network.​

The USB 3.0 ports can deliver better performance than USB 2.0 ports. Most routers struggle to power large, power-hungry HDDs reliably. Instead, an externally powered HDD or a portable SSD drive is ideal, especially one that doesn't suffer from aggressive thermal throttling.

Small port with big potential

A router’s USB port won’t exactly replace a full-blown NAS or add another Ethernet port without shortcomings. With custom firmware and modest expectations, it can handle file sharing, media streaming, DNS filtering, and VPN services. That’s good enough for you to try out things your router already supports before doling out cash on expensive hardware. Though overlooked, it can solve a problem without much effort.