One PC, multiple IPs

From: Michael Weiss (MichaelWeiss_at_discussions.microsoft.com)
Date: 02/26/05 

Date: Sat, 26 Feb 2005 12:15:03 -0800

I'm trying to put together a load testing system for an exsisting system I'm
working on.

The system consists of several embedded (non-windows) networked devices
(RFID readers, but I'll just refer to these as "clients") and one central
"server" a part C++ 7.1 and VB6 Windows application. Each client has a static
IP address and makes a socket connection to the application server using port
number X. Then the server makes a connection back to the client using port
number X+1. The server keeps a lot of pre-set configurations for each client,
and the only way it can identify one client from another is by it's IP
address.

What I want to do is to simulate multple clients on one PC. The actual
client hardware is expensive, large, and in short supply to product
development. We do have pure-software Windows simulators for the hardware.
The problem is you cannot run more then one simulator one PC since the server
wants each client to have a different IP. Changing this one client/one IP
system just for testing isn't really an option.

What I'd like to do is put multiple NICs in one PC. Give each one a unique
IP and hook them all into the same network. start one client per NIC and
somehow make each client connect to and accept connections from the server
via thier unique IP/NIC. Even better would be a way to do this one NIC. I've
thought about using Virtual PC, but that seems like overkill.

Can this be done? Currently my test client is VB6 with some 3rd party socket
OCX. But I'm willing to rewrite it with C++ or C#.

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