Buffers and TCPWindowsize...WAS: PTP latency

Tue Oct 2 04:24:11 UTC 2001

Dear list,

Thank you for all the great responses regarding the PTP latency issue.  This was very thorough information that will help me make a decision.

A related, yet somewhat separate issue that I would like some advice on is what kind of circumstances would cause a tcp congestion window to be reduced over a WAN connection, assuming that the servers on both sides are not busy (or even barely utilized).  Assuming that a 1472 byte packet could pass freely from WAN point A to WAN point B without being defragmented, it has been suggested to me that somehow windowing is playing a role in poor throughput.  

I understand the role that windowing plays in tcp/ip, I guess what I'm wondering is how that packet could get 'squeezed' as it passes through a WAN.

Thank you,
Christopher