Mahendranath,
You need to provide a little more info for us to help.
I am sure that "Ethernt 2, src : HewlettP_5c:80:39" isn't all that appears the information on the packets you are seeing. The best guess is that "Ethernet 2" is the name of interface and that "HewlettP_5c:80:39" is simply the source MAC address of the packet (where the first 3 bytes of the actual MAC address xx:xx:xx get resolved to HewlettP")
I think we would need to see a well-filtered sample of the packets from your manual and Loadrunner scenarios to be able to compare. (Loadrunner tries to "emulate" clients so it simply might be not be a perfect emulator)
Regards, Martin
MartinVisser99@xxxxxxxxx