I have a user complaining that whenever he is doing a large download his SSH seession becomes very laggy and unresponsive. He connects with an Alvarion SU and a PPPoE connection to our Mikrotik router. I thought this was normal but he claims with a DSL or Cable connection in the past this never happened.

Do Cable or DSL modems do some sort of QOS that results in that or is he just mistaken?

Matthew

What are his MTU values ?
What are the MTU and MRU values on your PPPoE server?
Do you have a mangle rule in your firewall settings?

I do not have that mangle rule for that setup or Change TCP MSS in the PPPoE profile enabled. My fear with doing that was a user will need something smaller then 1492 and that might break it. But this is a Linksys router doing pppoe into us. Every one I have seen sets MTU at 1492 whenever PPPoE is used by default. Quite obviouslly the Mikrotik PPPoE server sets MTU at 1492 also.

Matthew

Set the MTU and MRU value to 1480.
Set the mangle rule to action=passthrough