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hci
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Saturating PPPoE Connection

Wed Jan 26, 2005 7:34 pm

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
 
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YazzY
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Wed Jan 26, 2005 10:46 pm

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?
 
hci
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Wed Jan 26, 2005 11:01 pm

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
 
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YazzY
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Thu Jan 27, 2005 2:27 am

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

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