What is this loopback tester do? If it works.

Discussion in 'Windows Networking' started by news, May 11, 2005.

  1. news

    news Guest

    I have an old co-worker who at least knew enough about networking to
    try to teach me a way to figure out what class an IP address is, and
    what IP ranges are available in a subnet.
    I've since forgotten all that (and wish I still knew it.)

    But anyway, he gave me this little device, a few inches of CAT-5 with
    both ends terminating in the same RJ-45 plug.
    It looks like wire 1 goes to 2, and 4 goes to 6.
    It's my understanding this thing is supposed to fool the NIC that it's
    plugged into a network, allowing you to...do something.
    But I don't know what. Supposedly something that's more infomative than
    just pinging

    Any ideas what this does and how I can use it?
    PS: Any pointers to a site that teaches you how to figure out what IP's
    are available in a subnet would be cool too. =)
    news, May 11, 2005
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