IP Address Config

[Alan Horn]

On Fri, 14 Oct 2005, Ki Il Song wrote:

>Date: Fri, 14 Oct 2005 15:24:40 -0400
>From: Ki Il Song <ki at knifecenter.com>
>Reply-To: For users of Fedora Core releases <fedora-list at redhat.com>
>To: For users of Fedora Core releases <fedora-list at redhat.com>
>Subject: Re: IP Address Config
>
> 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?

If you read below the piece that says :

> 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.


then .1 falls within the subnet that I assumed you were talking about.


Cheers,

Al

>
> 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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