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Cell Relay Retreat>List Archive>month:1995-Apr> msg00393



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Re: TCP window size

  • From: vjs@calcite.rhyolite.com (Vernon Schryver)
  • Date: Tue, 25 Apr 1995 04:53:28 -0500, Mon, 24 Apr 1995 23:51:52 GMT

In article <3nh090$56t@usenet.srv.cis.pitt.edu> fahad@cs.pitt.edu (Fahad A Hoymany) writes:

> ...
>   The problem with the window size goes right down to the length of the
>   window field in the TCP header.  Currently this is a 16-bit field, which
>   means that you cannot advertise a window of size larger than 64KB! The
>   trick used in some TCP implementation is to scale this field by using
>   a scale factor stored in the options field.  So, you get as large as
>   2**30 bytes, which is enough to support any high-speed links.


RFC 1323 is too standard to be called a trick.  I think at least 3 or
or 4 commercial UNIX systems are shipped with RFC 1323 support.  I know
at least two are currently shipped that way, including one for PC 386
clones.


Vernon Schryver    vjs@rhyolite.com