Aggregation Not working as Expected

[Yessine1200]

Expected Behavior

Link Aggregation maximizes the capacity across all connections. (35-45M)

Current Behavior

It seems like connections are always getting slowed down(for 4G SFR and private 5G)

Lan1 : 4G ORANGE - 10,7M

Lan2: 4G SFR (very slow)

Private 5G - 13,8M

Aggregation - 11,4M

It seems that the aggregation is working fine, but with limited speed for the two connections (SFR and Private 5G)

Status page

Specifications

• OpenMPTCProuter version: 6,1
• OpenMPTCProuter VPS version: 0.1030 6.1
• OpenMPTCProuter VPS provider:
• OpenMPTCProuter platform: BPI-R64

[Ysurac]

You seems to have a high load average on the BPI-R64. You can try to add/remove connections, to check if a connection is not limiting aggregated speed. What is the proxy used ?

[Yessine1200]

high load average is related to the RAM ? Shadowsocks Rust for the proxy.

[Ysurac]

It's related to CPU. Encryption can be CPU intensive.

[Yessine1200]

Hello Ysurac Is it possible that one connection could block the other connection from using all its throughput?

[Ysurac]

Should not, but this can happen

[Yessine1200]

or can be related to the router ?

[Ysurac]

yes this can be. BPI-R64 have a slow CPU.

[Yessine1200]

Because for now, when I aggregate two 4G connections, it works perfectly. I get the correct aggregation, and it's stable.

But when I try to aggregate the private 5G standalone and 4G connection, I notice that the 4G connection blocks the 5G standalone. However, when I run the command omr-test-speed lan2, I can get the correct throughput of the 5G connection which is 130Mpbs.

This is why I mentioned that one connection might block the other connection based on the results that I got.

[Ysurac]

You can try to run omr-test-speed lan2 and omr-test-speed the4ginterface at the same time, to check the result.

[Yessine1200]

I first launched omr-test-speed lan2 for the 5G standalone:

After 2 minutes, I launched omr-test-speed lan1 for the 4G connection without stopping the speed test for the 5G connection, and I observed that the throughput of the 5G connection decreased as shown below.

[Ysurac]

I think you have a congestion point somewhere on the network.

[Yessine1200]

And you know how can I find this problem ?

[Ysurac]

by checking where can be the bottleneck on the network, if there is something shared with both network.

[Yessine1200]

Doesn't the BBRv3 algorithm prevent this from happening?

[Ysurac]

If it's not possible to have a higher speed due to a bottleneck, no algorithm can do anything.

[Yessine1200]

by checking where can be the bottleneck on the network, if there is something shared with both network.

No, there is nothing shared in my network. I am using two different ISPs. It's really weird that I have this issue.

[Ysurac]

I don't know what your 5G network is using as source ISP/network type. Difficult to say anything about that. You can test network using 2 phones or devices connected to both network and check the same way if you have same problem or not.

[Yessine1200]

Hello Ysurac, I tested again this morning, and it's working fine. I think the problem was with the Banana Pi. Now, I am trying to activate the WiFi on the Banana Pi. I followed your documentation and successfully activated it, but when I try to connect a phone to it, I can't. However, I can see in the dashboard that it's connected.