i can try that updating , but its weird , also i have a SITE C that is connected to SITE B and wen i do the BT From C to B i also have the same problem BUT wen i do the BT from site C to Site A i have 300up and 300down .. really weird
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When you connect Site C to Site A is it going through Site Bor is there a switch at Site B.
This is looking very much like a firmware issue or a problem with Site B router. Can you confirm what speed your ports are set to on Site B. It may be worth while upgrading all to 6.29 and running the new fastrack feature.