Hello Sebb,

1, There is another very good reason to implement Virtual IPs. 

If threads (Virtual users) use individual IPs it will much easier
to debug correct functionality on any IP level test task. For
example with protocol analiser like www.ethereal.com (Exist for
Uni*X and Windows)

2, Most users use now CABLE modem like connections.

 - How you will emulate 1000 users with maximum speed 256Kbit,
but guarantee speed 128Kbit ??? This kind of emulation need to be
done on all connection level not only on level of individual IP
(thread, virtual user, ...)

 - How you will emulate speed when from 1000 users 300 have 128K,
400 256kbit and rest T1 (1500KBit)?

And finaly Linux shaping kernel mduels are whant most small and
medium ISPs use. With useage it for emulation we can be as much
as user will be in real world.       
Ing Rudolf Kutina
Practical tester
Prague
 



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