IP Address Config

[Alan Horn]

Yuck.. I read 248 as 240....

what he said.. divide my numbers by two :)



On Sat, 15 Oct 2005, david walcroft wrote:

>Date: Sat, 15 Oct 2005 09:06:18 +1000
>From: david walcroft <david_walcroft at yahoo.com.au>
>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
>
> Jeff Vian wrote:
>> On Fri, 2005-10-14 at 15:24 -0400, Ki Il Song wrote:
>> 
>>> 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?
>>> 
>> 
>> broadcast of 70.88.255.7
>> network of 70.88.255.0
>> 
>> 
>> For assistance in the future a quick google search for "subnet
>> calculator netmask" yielded over 16,000 results with the first page
>> including at least 7 on-line calculators that can determine the answer
>> to your question.
> Strange : I did the exact same search '"subnet calculator netmask" ' and found 
> '0'
>
>  david
>
>
>> 
>>> 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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>>> 
>> 
>
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