Network glitches costing 15 minutes a pop

Robert Collins robertc at robertcollins.net
Fri Aug 15 02:38:43 BST 2008


On Fri, 2008-08-15 at 11:19 +1000, Mark Hammond wrote:


> Me too - but who is setting that timeout? :)

http://msdn.microsoft.com/en-us/library/ms819737.aspx documents TCP's
behaviour on windows.

One possibility, simple retransmission delay would give us:
 3 seconds (default RTT estimate) * 5 attempts = 15 seconds.

but 900 seconds is is 60 times as long, and it would require 5 dropped
packets in a row.

Another possibility is high packet loss leading to many retransmits and
finally 5 failures in a row.

I think a packet dump would be useful at this point.

-Rob


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