in reply to Can I simulate IP-addresses?

This kind of depends on what you mean by come from different IP-addresses. If you mean different addresses in your company, that's one thing and may be possible depending on your network configuration. If you mean different locations on the Internet so you can test the response time from there, that's not so easy ;-).

What is the goal of the simulation?

--traveler

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Re: Re: Can I simulate IP-addresses?
by Anonymous Monk on Apr 13, 2001 at 04:03 UTC
    I don't know if it is possible but I want to make one computer look like it is really several comuters. First I'll check how long it takes for user1 with IP-address so and so, then I'll check how long it takes for user2 which have IP address so and so. But I only want to use one computer so I need to make the requests pretend they are from different users...Does that make sense?
[reply]
      Are you sure you're solving the right problem?

      If you're running timing tests, in all probability what someone wants is to gather statistics on how long it takes to load the pages from different computers. But they might not understand enough about networking to further qualify their request to mean computer located in different places on the internet, reaching the website through different paths.

      Gathering statistics from one computer that's pretending to be several is rather like asking the same person to take a survey three times.

      You may need to have a talk with whoever is asking you to run this experiment, to explain to them a bit about how networks work, and to help them clarify what they're trying to measure.

[reply]
      To do this correctly, the host doing the queries needs to have multiple IP addresses. I don't know how this is done in Windows, but under Unix it can be accomplished using IP aliasing or whatever synonym is appropriate for your OS variant. Contact your system or network administrator for help with this.

      Once the machine is configured with multiple IP addresses per your needs, make use of the bind function before you make your outbound connect (this can be done with IO::Socket just as easily using the LocalAddr variable). This ensures the outbound connection comes from the IP address (and port, if you want that level of control) that you want.

[reply]

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