Re: Spider with improbable IP address

From: Bennett Todd (bet_at_rahul.net)
Date: 10/15/04

  • Next message: k levinson: "RE: Spider with improbable IP address" 
    Date: Fri, 15 Oct 2004 17:30:21 +0000
To: Ed Wittmann <wittmann@sae.org>

    2004-10-14T18:14:01 Ed Wittmann:
    > xxx.xxx.xxx.0
    >
    > Now, I was under the assumption that you can't send and receive on this
    > address - but the requests come in here, and they're clearly going back
    > out here. The weblogs show this address.

    The .0 address is routinely the network number, not a usable IP
    address --- but this is only because CIDR blocks used as IP nets are
    routinely /24 and smaller. Consider the perfectly legitimate IP
    network (in RFC 1918 space, for illustration purposes)

            10.0.0.0/23

    Here are the relevent details:

            255.255.255.128 netmask
            10.0.0.0 network number
            10.0.0.1 host addr
            10.0.0.2 host addr
               ...
            10.0.0.254 host addr
            10.0.0.255 host addr
      ==> 10.0.1.0 host addr
            10.0.1.1 host addr
               ...
            10.0.1.254 host addr
            10.0.1.255 broadcast addr

    There's a legit xxx.xxx.xxx.0 host addr. And right before it is
    another unexpected sight, an xxx.xxx.xxx.255 host addr.

    -Bennett

  • Next message: k levinson: "RE: Spider with improbable IP address"

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