Hi,
I have a problem with speed on one of my wifi sites.
I try to explain a little more:
Site A – Mikrotik 10.250.0.1 – Bridge – Ubiquiti AP for “B”
Site B- Mikrotik 10.250.0.2 – Bridge – Ubiquiti Station to “B” and another AP pointing to “C”
Site C – Mikrotik 10.250.0.3 – Bridge – Ubiquiti Station to “C” and anothers AP for clients

My broadband is 25Mbps/25Mbps from my isp. When I make a bandwidth test from Site A to B the up/down is almost 25 Mbps. When I do the same for Site B to C is almost 25 Mbps.
Also the speedtest on the ubiquiti from A to B, and B to C is over 48 Mbps.

The problem is that when I make a bandwidth test from Site C to A the up/down decrease at 2Mbps to 7Mbps unstable. I don’t know where is the problem, because from site to site the bandwidth are perfects.

The clients connected to Site C report Slow internet.

I appreciate any help!

check all your ethernet ports in the routerboards are running at full duplex. I have seen many times data rate negotiation failing between MT & UBNT devices causing the exact symptoms you descibe

If this turns out to be the cause simply force the port to 100 /full (auto off) and your problem will be gone