On Fri, 14 Oct 2005, Ki Il Song wrote:
Date: Fri, 14 Oct 2005 15:24:40 -0400
From: Ki Il Song <ki@xxxxxxxxxxxxxxx>
Reply-To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx
From: Alan Horn <ahorn@xxxxxxxxxx>
Reply-To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
Date: Fri, 14 Oct 2005 12:03:29 -0700 (PDT)
To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Reply-To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
To: fedora-list@xxxxxxxxxx
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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