Hello Jmeter developers,

It will be nice to have in Jmeter emulation of User speed
connection. However to do this task in Java can be not practical
and easy.

Another way to this problem can be to add support for virtual IP
addreses in clients (per thread ???). Most testing is done in
laboratory or after firewall conditions and huge block of IPs
like 192.168.x.x or 10.x.x.x can be easily used.

-------------------------------------------------------
Java have on java.net.Socket parameter for it:

public Socket(InetAddress address, int port, InetAddress
localAddress, int localPort) throws IOException

Its also part of org.apache.commons.httpclient.HttpConnection

as 

setLocalAddress(InetAddress localAddress) 

Set the local address used when creating the connection. 
-------------------------------------------------------

For getting valid virtual IP addreses module for reading User
parameter from file can by modified (One IP per thread if there
is anought in list).

Using virual IP addesses give to tester posilibty to use Linux
kernel based shaping modules to emulate client banwith. This
modules have also nice interfaces so this aproach can by used
also by non Linux adminstrators.

I can test this feaure with tpcdump and ethernal if jmeter team
will impement it. I can also write small howto use it if somebody
will check my english in it. 

Ing Rudolf Kutina
Practical tester
Prague



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