IP Address Config

[Jeff Vian]

On Sat, 2005-10-15 at 09:06 +1000, david walcroft wrote:
> 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
> 

Sorry for not being clear.  The 3 words were not quoted in my search. I
wanted to find things with all 3 words, not with the exact phrase.  In
the sentence above I used quotes to identify the words and was not clear
enough that the search was for words and not a phrase.

> 
> > 
> >>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
> >>>To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
> >>
> > 
>