Re: Need help (of course) setting up network

From: Scot L. Harris (webid_at_cfl.rr.com)
Date: 05/08/04

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Sat, 08 May 2004 10:13:55 -0400

    On Sat, 2004-05-08 at 10:05, Jamie Cadorette wrote:
    > >> I'm' not a network expert, and others will probably
    > correct me if I am wrong, but I think it is unusual or
    > even plain wrong to have an IP address (inet addr)
    > ending in .0. The last number should be between 1 and
    > 254. Did you set this yourself, or was it allocated
    > by DHCP? <<
    >
    > This is correct. With an IP address, a hostid of all
    > zeroes (ending in .0) and a hostid of all ones (ending
    > in .255) are both reserved. A valid IP should end with
    > a number from 1 through 254. It has been my experience
    > that the number 1 is usually seen on DNS servers and
    > routers.
    >
    > - Jamie

    It all depends on the subnet mask which defines what portion of the IP
    address represents the network and what portion represents the host
    addresses. If your network uses a 16 bit subnet mask there can be
    several host address that end in 0 and 255.

    Very strange looking but perfectly valid.

    In the case described above they have a 24 bit subnet mask, in that case
    you are correct the address ending in 0 is the network and 255 is the
    broadcast. 

    -- 
Scot L. Harris <webid@cfl.rr.com>
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