[e2e] Windows NT implementation of TCP

Christian Huitema huitema at windows.microsoft.com
Mon Jul 23 11:12:36 PDT 2001

> >> First, apologies if it's not appropriate to be asking
> >> a question like this.  I was trying to find out what
> >> flavor of TCP Windows NT 4.0 uses.  Specifically, I'm
> >> trying to find out if it uses fast retransmit.
> While it it true that Windows NT and Windows 2000 both implement
> Fast Retransmit, in many cases, due to a bug in the implementation,
> Fast Retransmit is never invoked, and the TCP sender has to wait
> for a Retransmit Timeout to retransmit a lost packet.  This is
> discussed in more detail in the TBIT paper by Padhye and Floyd,
> available from "http://www.aciri.org/tbit/".

The bug occurred in Windows 2000, and has been fixed in the Service Pack
1 issued in July 2000. The bug does not affect NT4 or XP, or any version
of W2K SP1 or greater.

-- Christian Huitema

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