Success with dual WAN aggregation – questions about adding mobile WAN3

[slapshot]

TL;DR: With WAN1+WAN2 (fibers) I can reach almost the full sum of both lines (~245 Mbit/s down, ~37 Mbit/s up) after disabling SQM/autorate/auto-calc and entering manual speeds. Adding WAN3 (mobile, 50–80/12–15, 30 ms latency) is unstable: sometimes higher download peaks, but usually degrades the whole aggregation. Looking for advice on best practices to integrate mobile WANs.

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✅ Dual WAN aggregation (WAN1 + WAN2)

• WAN1: ~150 Mbit/s down / ~20 Mbit/s up
• WAN2: ~100 Mbit/s down / ~17 Mbit/s up
• Total capacity: ~250 Mbit/s down / ~37 Mbit/s up
• Tunnel: Glorytun UDP
• OMR version: 0.63-6.12

After some tuning I can now reach almost the full sum of both lines, both in download and upload.

What worked for me:

• Disabled Enable SQM and SQM autorate on both WANs
• Disabled Calculate speed
• Entered manual bandwidth values, about 10–15% lower than the maximum measured capacity (both down and up)

With these changes I consistently get 220–245 Mbit/s down and 36–37 Mbit/s up, which is very close to the theoretical maximum.

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⚠️ Issues with WAN3 (mobile phone via USB–Ethernet)

I tried to add a third WAN using a mobile connection (50–80 Mbit/s down / 12–15 Mbit/s up, ~30 ms latency).

Settings applied:

• Force TTL = 65 (to avoid carrier tethering limits)
• Disabled SQM, SQM autorate, and Calculate speed (same as WAN1/2)
• Tested with different lower manual values for down and up

Results:

• Speeds are inconsistent and often degrade overall performance.
• Once, with a particular combination, I saw a 325 Mbit/s peak in download, but at the cost of a severely limited upload.
• In most other cases WAN3 just adds instability and doesn’t improve the aggregate.

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❓ Question

Do you have suggestions on how to best exploit the mobile line within aggregation?
I’d like to keep WAN3 in the mix if possible, especially for its upload, but so far it either:

• reduces the overall throughput, or
• only shows occasional spikes that are not sustainable.

Any advice on scheduler choice, weighting, or specific tuning tricks for mobile WANs in OMR (with Glorytun UDP) would be greatly appreciated!

Thanks in advance.