3c501 users please read this

Russ Nelson nelson at sun.soe.clarkson.edu
Wed Feb 6 07:50:01 AEST 1991

Sorry to post this so widely, but since the question has come up
recently twice on the net, and twice locally to Clarkson, people
should be aware of this problem.

The 3c501 cannot receive back-to-back packets (two packets addressed
to the same host with no intervening packet).  BSD Unix (well, SunOS
and NeXTos at least) will attempt to fill your TCP window by sending
back-to-back packets.  Therefore, your TCP Window must not be larger
than your TCP MSS.

  o Under KA9Q, use "tcp window 1024" and "tcp mss 1024".
  o Under SCO Xenix, use the UNDOCUMENTED ifconfig option -onepacket.
  o Under NCSA Telnet, use "maxseg=1024" and "rwin=1024".
  o Under FTP Software's PC/TCP, use "ipconfig window 1024".

--russ <nelson at clutx.clarkson.edu> Humble Quaker, and damned proud of it.
It's better to get mugged than to live a life of fear -- Freeman Dyson
I joined the League for Programming Freedom, and I hope you'll join too.

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