IP Address Config

Jeff Vian jvian10 at charter.net
Fri Oct 14 22:22:14 UTC 2005


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.

> 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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