Your two lines are not twins — one is 100 Mbps, the other is 25. If the router splits sessions 50-50 anyway, half your users land on the slow line and complain, while the fast line sits half empty. The weights setting exists precisely for this.
✍️ Technical Anshu🪟 Windows 10 / 11⏱️ 7 minute read
🎥 Watch the full process in the video — combining 2 connections with real testing, step-by-step
Load balancing weights (also called ratio or share) tell the router what fraction of new sessions each line should receive. The rule that always works: weights should match the lines' real speeds. Get this one setting right and the most common dual-WAN complaint — 'sometimes the internet feels fast, sometimes slow' — quietly disappears.
Weights that match the lines — 100 Mbps and 25 Mbps
WAN1 — 100 MbpsWeight 4 — 80%
WAN2 — 25 MbpsWeight 1 — 20%
Wrong way — equal weights on unequal lines
⚠️ 50 : 50 splitSlow line saturated, fast line idle
Divide both speeds by the smaller one — 100 and 25 become the simple ratio 4 to 1
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Calculate Your Ratio in Ten Seconds
Write down each line's real measured speed (test each line alone — plan speed and real speed often differ)
Divide both numbers by the smaller speed and round to whole numbers
Some routers ask for percentages instead — then it is the same maths: 100 + 25 → 80% / 20%
Use measured speed, not the brochure speed. In the video's office the per-connection caps made 'real' speed very different from plan speed — weights follow reality.
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Where the Setting Lives
Look under WAN → Dual WAN → Load Balance, or Network → Multi-WAN → Policy — every brand names it differently
The field may be called Weight, Ratio, Session share or Bandwidth ratio
Enter the ratio for both WANs, save, and reboot if the router asks
Balancing by sessions is standard; a few routers also offer balancing by traffic volume — sessions is the safer default
Take a photo of the working page on your phone. Router settings have a way of being reset by the next helpful visitor.
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Verify With the Router's Own Counters
Weights are a promise; the traffic counters are the truth:
Use the network normally for an hour or two
Open the router's per-WAN traffic statistics and compare the data moved on each line
The split should be roughly your ratio — about 4 : 1 in the example — not exact, but clearly not 1 : 1
If one line is still overloaded, nudge its weight down a step and re-check the next day
Small deviations are normal — sessions are different sizes. You are looking for the pattern, not a perfect fraction.
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Unequal Lines, Honest Expectations
Weights fix fair sharing, not physics: a single download still cannot exceed one line without bonding or parallel connections
A very weak second line (say 10 Mbps next to 200 Mbps) adds little daily speed — its real value may be failover instead; consider failover mode
Revisit weights whenever a line's plan changes — upgraded one line? Recompute the ratio
Set by speed, verify by counters, adjust once — then leave it alone. Constant tweaking creates more complaints than it cures.
🔴 Equal weights on unequal lines is the most common dual-WAN mistake. The slow line saturates, sessions queue on it, and users conclude 'combining made things worse'. Match weights to measured speeds and the same setup suddenly feels right.
🎥 Watch the Complete Video Guide
Watch the video to see real lines with very different real-world speeds — and why the numbers on paper are not the numbers that matter.
My lines are 100 Mbps and 50 Mbps. What weights should I set?
Divide by the smaller speed: 100 and 50 become 2 and 1, so set weights 2 : 1 (or 67% / 33% if your router uses percentages). The 100 Mbps line then receives about twice the sessions of the 50 Mbps line, matching their capacity.
Should weights use the plan speed or the tested speed?
The tested speed. ISPs often deliver or cap differently from the plan — the video's office had a 250 Mbps plan delivering about 25 Mbps per connection. Measure each line alone and build the ratio from real numbers.
Sessions or bandwidth — which balancing mode is better?
Session-based balancing is the normal, stable choice: each new session is assigned by weight and stays on its line, which also keeps logins and banking happier. Bandwidth-based modes exist on some routers but can move traffic in ways that break sessions.
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 🙏