To all,
  I am currently a student at Oklahoma State University.  I am doing a Research 
project on an Enterprise network with Iperf.  I am encountering an anomaly that 
I haven't been able to figure out.  When I run a UDP test at a packet size of 
1470 the test will consistently fail (Warning: ack of last datagram not 
received after 10 tries).  If I lower the packet size below 1273 then the test 
will consistently pass but still fail occasionally.  Is there anything 
particular about the way Iperf creates the packets and/or socket that may be 
seen as suspicious or unallowable on a typical large campus network?  I am 
aware of the overhead created by Iperf and the MTU on the routers the packets 
have to cross are set to 1500.  The DF bit is also turned off on the routers.  
The packets are also travelling by way of a GRE tunnel which also creates its 
own overhead.  I am not much of a programmer so I can't really determine what I 
need  to know by looking at the source code.  Any help on this matter would 
greatly appreciated.  Thanks.

Matthew Reynolds
(405)613-1016
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