UDP transfer issue


Hello all,
 
I am using the basic functions of Iperf to test udp transfers between switches.

I have one laptop connected at 100 mbps to switch 1, a gigabit fibre link to another switch where I connect a 2nd laptop running iperf at 100 mbps.

Laptop 1 is running iperf using the command "iperf -s -u -w 64k" while laptop 2 is running "iperf -c 192.168.0.1 -u -b 95M -w 64k -i 1"

The transfer kicks off fine but I then get the following result
 
"[ ID] Interval       Transfer     Bandwidth
[1952]  0.0- 1.0 sec  11.1 MBytes  92.9 Mbits/sec
[1952]  1.0- 2.0 sec  11.3 MBytes  94.8 Mbits/sec
[1952]  2.0- 3.0 sec  11.2 MBytes  93.9 Mbits/sec
[1952]  3.0- 4.0 sec  11.3 MBytes  94.8 Mbits/sec
[1952]  4.0- 5.0 sec  11.3 MBytes  94.8 Mbits/sec
[1952]  5.0- 6.0 sec  11.4 MBytes  95.7 Mbits/sec
[1952]  6.0- 7.0 sec  11.2 MBytes  93.8 Mbits/sec
[1952]  7.0- 8.0 sec  11.3 MBytes  94.8 Mbits/sec
[1952]  8.0- 9.0 sec  11.4 MBytes  95.7 Mbits/sec
[1952]  9.0-10.0 sec  11.3 MBytes  94.8 Mbits/sec
[1952]  0.0-10.0 sec   113 MBytes  94.6 Mbits/sec
[1952] WARNING: did not receive ack of last datagram after 10 tries.
[1952] Sent 80452 datagrams"
 
Why am i getting this error, when I do the same test with the two laptops and a cross over cable it completes.

Any ideas, sorry if this has been covered in the past.
 
Cheers

Lee


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