IP Address Config

[Ki Il Song]

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 at knifecenter.com

> From: Alan Horn <ahorn at deorth.org>
> Reply-To: For users of Fedora Core releases <fedora-list at redhat.com>
> Date: Fri, 14 Oct 2005 12:03:29 -0700 (PDT)
> To: For users of Fedora Core releases <fedora-list at 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 at knifecenter.com>
>> Reply-To: For users of Fedora Core releases <fedora-list at redhat.com>
>> To: fedora-list at 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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