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Internet Message Format  |  1993-01-11  |  955 b 
  1. Xref: sparky comp.sys.sun.apps:2944 comp.protocols.tcp-ip:5923
  2. Path: sparky!uunet!cs.utexas.edu!rutgers!att-out!cbnewsd!pccl
  3. From: pccl@cbnewsd.cb.att.com (paul.c.liu)
  4. Newsgroups: comp.sys.sun.apps,comp.protocols.tcp-ip
  5. Subject: tcp_mss "downshift" with consecutive rcp's
  6. Keywords: tcp_mss is reduced from 1460 to 512
  7. Message-ID: <1993Jan12.003854.5821@cbnewsd.cb.att.com>
  8. Date: 12 Jan 93 00:38:54 GMT
  9. Distribution: usa
  10. Organization: AT&T
  11. Lines: 15
  12.  
  13. A while ago, I recall a netter from SGI posted an article
  14. detailing a BSD TCP bug fix for the tcp_mss "downshift" symptom.
  15.  
  16. Symptom: consecutive "rcp remhost:remfil locfil" will result
  17.      in smaller TCP payload (i.e. from 1460-byte to 512-byte),
  18.      unless there is 60+ seconds time gap in between.
  19.  
  20. To reproduce: use three Suns, on sun_a, do 
  21.     rcp sun_b:file1 file1, and
  22.     rcp sun_b:file2 file2
  23.     and run tcpdump/etherfind on sun_c to trace the network traffic.
  24.  
  25. Pointers are appreciated!
  26.  
  27. Paul.C.Liu@ATT.COM
  28.