From: Wade Edwards (wade.edwards@xxxxxxxxxxxxxxxxxxx)
Date: Fri Aug 09 2002 - 13:45:27 GMT-3
I would really like to know why this is bad. Is it bad because it makes
troubleshooting harder? Is it bad because it breaks some old software
that uses all ones and all zeros IP addresses for something? I have
never understood why all one and all zeros on the subnet portion are
bad. I know why on a host portion that we don't use all ones, this is
the broadcast address, and why we don't use all zeros, this is also a
broadcast address (although not used anymore but needed for backwards
compatibility), but never the subnet portion.
L8r
-----Original Message-----
From: Dan.Thorson@seagate.com [mailto:Dan.Thorson@seagate.com]
Sent: Friday, August 09, 2002 11:01 AM
To: Wright, Jeremy
Cc: 'ccielab@groupstudy.com'; nobody@groupstudy.com
Subject: Re: ip addr 10.0.0.254/24
10.0.0.254/24 is considered bad form as the subnet portion of the IP
address is all zeros....
Given a class-A network with a /24:
255.0.0.0 network portion
0.255.255.0 subnet portion
0.0.0.255 host portion
and so
10 - network
0.0 - subnet
254 - host
Notice that the subnet is all zeros... bad.
========================================
Dan Thorson - Seagate Technology, LLC
desk +1 (952) 402-8293 fax +1 (952) 402-1007
SeaTel 8-402-8293
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