Two Network Adapters on One Windows PC Metric Bridge and Bonding Truth
The cheapest version of combining sounds obvious: my PC has a LAN port and a Wi-Fi adapter — connect both, get both speeds. Windows has other ideas, and understanding them will save you an evening of confusion.
✍️ Technical Anshu🪟 Windows 10 / 11⏱️ 9 minute read
🎥 Watch the full process in the video — combining 2 connections with real testing, step-by-step
Windows is not being stubborn; it is following the rules of routing. A PC sends traffic through one default route — the adapter chosen by the interface metric. The second adapter waits, mostly idle. This page explains exactly what Windows does with two adapters, what the metric setting can and cannot change, why Network Bridge is not a speed tool, and where NIC teaming actually belongs.
Two default routes — Windows prefers the one with the lower metric (25) for almost everything
1
See What Windows Is Actually Doing
Connect both adapters to their networks and confirm each works alone
Open Command Prompt and run route print -4
Find the two rows starting with 0.0.0.0 — these are your two default routes
Compare the Metric column: the lower number wins, and nearly all traffic follows it
netsh interface ipv4 show interfaces lists each adapter with its current metric
Nothing is broken — this is designed behaviour. A normal PC is simply not a load balancer.
2
Use Metric to Choose Your Primary Line
The metric's real job is preference — which line is primary, which is the understudy:
Decide which connection should carry normal traffic (usually the faster, more stable one)
Set its metric lower: netsh interface ipv4 set interface "Ethernet" metric=15
Set the other adapter higher, for example metric=50
Untick Automatic metric in the adapter's advanced TCP/IP settings if Windows keeps resetting your values
What you gain: predictable choice of primary line. What you do not gain: combined speed — the second adapter still does not share ordinary traffic.
3
Network Bridge Is Not a Speed Tool
Windows offers Bridge connections when you select two adapters — and the name misleads many people:
A bridge joins two network segments so devices on each side can reach each other — it is a connector, not a combiner
Bridging your two internet adapters does not add their speeds; it typically makes routing worse and can break both connections' addressing
Legitimate use: letting a device on one segment talk to devices on another — a lab and office trick, not a home speed trick
If a guide tells you to bridge two adapters for double speed, close that guide.
4
NIC Teaming — Real Bonding, Wrong Problem
True adapter bonding on Windows is called NIC teaming / LBFO — built into Windows Server, and on desktop Windows only via some Intel/Realtek vendor tools
Teaming needs a managed switch configured with LACP on the other end of both cables
It bonds your PC to the switch — your LAN gets faster, but the internet still leaves through one line or one router
So teaming is the right tool for a server moving files to many office PCs — and the wrong tool for making one home internet connection faster. For internet combining, the honest routes remain: a dual-WAN router, or bonding software that recombines traffic at an outside server.
🔴 Two adapters plus Windows equals one active default route. Metric chooses the favourite, Bridge joins networks, Teaming needs a managed switch and fixes LAN speed — none of them merge two internet lines on a normal PC. Anyone selling a registry tweak that 'unlocks' this is selling fiction.
🎥 Watch the Complete Video Guide
Watch the video for the combining methods that do work, with real lines and real measured results.
I connected LAN and Wi-Fi together. Why is only one being used?
Windows routes traffic through one default gateway — the adapter with the lower interface metric. The other adapter stays as a standby path. This is normal routing behaviour, not a fault, and no setting makes ordinary Windows share both for one download.
What does interface metric actually do?
It ranks your adapters. When two routes lead to the same destination, Windows picks the lower metric. Setting a low metric on your best line makes it the primary; the higher-metric adapter is only a fallback. Check values with route print -4.
Can NIC teaming double my internet speed?
No. Teaming bonds your PC to a managed switch, speeding up local network transfers. Your internet still exits through one WAN line or router. Internet combining happens in a dual-WAN router or through bonding software with an external server.
This guide is based on the Technical Anshu video on combining 2 LAN connections • Stuck on a step? Ask in the video comments — the community helps there 🙏