e1000 is subtly incompatible with jumbo frames

[Maurice Volaski]

I have a system using the e1000 driver with the MTU set to 9000. If I 
try FTP to get a file, the transfer does not start. Something about 
the 9000 MTU is preventing the NIC from receiving packets back from 
the FTP server. (The FTP server is on the same subnet and its NIC 
also has MTU 9000.) The 9000 MTU NIC works fine in every other 
respect, even allowing me to access the system via ssh. When I change 
the MTU to 1500, then FTP works fine. The problem is common to 
numerous kernel versions including 2.6.24 through 2.6.29-rc5.
--

Maurice Volaski, mvolaski@xxxxxxxxxxxx
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University
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