Re: IP Address Config

From: Ki Il Song (ki_at_knifecenter.com)
Date: 10/14/05

  • Next message: Alan Horn: "Re: IP Address Config" 
    Date: Fri, 14 Oct 2005 15:24:40 -0400
To: For users of Fedora Core releases <fedora-list@redhat.com>

    The subnet mask is: 255.255.255.248
    The ip address i want to assign is: 70.88.225.1

    So what should my broadcast and network addresses be?

    Regards,
    Ki Song

    ----------
    Knifecenter, Inc.
    5111 Berwyn Road STE 110
    College Park, MD 20740
    (301) 486-0901
    ki@knifecenter.com

    > From: Alan Horn <ahorn@deorth.org>
    > Reply-To: For users of Fedora Core releases <fedora-list@redhat.com>
    > Date: Fri, 14 Oct 2005 12:03:29 -0700 (PDT)
    > To: For users of Fedora Core releases <fedora-list@redhat.com>
    > Subject: Re: IP Address Config
    >
    >
    > On Fri, 14 Oct 2005, Ki Il Song wrote:
    >
    >> Date: Fri, 14 Oct 2005 14:44:32 -0400
    >> From: Ki Il Song <ki@knifecenter.com>
    >> Reply-To: For users of Fedora Core releases <fedora-list@redhat.com>
    >> To: fedora-list@redhat.com
    >> Subject: IP Address Config
    >>
    >> I am trying to change my IP Settings updating my ifcfg-eth0 settings.
    >>
    >> Basically, I want to set it up using a static IP, with subnet
    >> 255.255.255.248, gateway 70.88.x.x and ip address 70.88.x.x (x will be
    >> replaced with real ip address).
    >>
    >> Here is my current ifcfg-eth0 file:
    >>
    >> +++++++++++++++++++++++++++
    >> DEVICE=eth0
    >> BOOTPRO=static
    >> BROADCAST=70.88.225.255
    >> IPADDR=70.88.225.1
    >> NETMASK=255.255.255.248
    >> NETWORK=70.88.225.0
    >> ONBOOT=yes
    >> TYPE=Ethernet
    >> +++++++++++++++++++++++++++
    >>
    >> Questions:
    >> Where do I put in my Gateway address?
    >
    > GATEWAY goes in /etc/sysconfig/network generally.
    >
    >> What are the BROADCAST and NETWORK addresses?
    >
    > You don't provide enough information with the x.x piece to determine the
    > subnet with that netmask, so theres no way for me to guarantee that this
    > info is right.
    >
    > However, if I assume you mean subnet 70.88.225.0 with 255.255.255.248
    > netmask. Then BROADCAST would be 70.88.225.15 and NETWORK would be
    > 70.88.225.0.
    >
    > In general a 248 netmask like that (also referred to as /28 network)
    > splits a traditional 'class C' (/24) into chunks of 16, starting with .0
    > in the class C as the first IP address, with the bottom address in each
    > chunk being the network, and the top address in each chunk being the
    > broadcast. If that makes sense ?
    >
    > So the subnets you get when splitting a /24 into multiple /28 (for this
    > number range) would be :
    >
    > 70.88.225.0-15 (1-14 useable IP addresses)
    > 70.88.225.16-31 (17-30 useable IP addresses)
    > 70.88.225.32-47 (33-46 useable IP addresses)
    > 70.88.225.48-63 (49-62 useable IP addresses)
    > 70.88.225.64-79 (65-78 useable IP addresses)
    > 70.88.225.80-95 (81-94 useable IP addresses)
    > etc... up to 255.. the math is boring me and hurting my head at this point ;)
    > I may have got it slightly wrong.. I hate enumerating small subnets.
    >
    > Hope this helps.
    >
    > Cheers,
    >
    > Al
    >
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