IP Address Config

[david walcroft]

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
>>>
>>>-- 
>>>fedora-list mailing list
>>>fedora-list at redhat.com
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>>
>