Fail to run sockperf ping-pong with (-F) iomux-type r

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What steps will reproduce the problem?
1.Create MCG file and copy it to server and client 
7.1.1.1:1000
227.1.1.2:1001
227.1.1.3:1002
227.1.1.4:1003
227.1.1.5:1004

2.Add route to specified device 
#route add -net 224.0.0.0 netmask 240.0.0.0 <device>
3.Run on server :
#sockperf server --nonblocked -f /tmp/sockperf_5 -F r --threads-num 5
Run on client :
#sockperf ping-pong -m 12 -t 10 --mps=MAX -f /tmp/sockperf_5 -F 4

What is the expected output? What do you see instead?
Test end with summary result of send and recievce message during specified time 


What version of the product are you using? On what operating system?
Red Hat Enterprise Linux Server release 6.4 (Santiago)
Sockperf version 2.5.225 

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 4 Aug 2013 at 12:47