From: P729 (p729@xxxxxxx)
Date: Fri Aug 09 2002 - 20:14:04 GMT-3
At least with 'ip subnet-zero' support we can tell Cisco (and Cisco-like)
routers to treat 10.0.0 as a subnet and not a supernet. This was a real
problem with certain (mainly host) implementations back in the day, but I
think it's pretty common treatment nowadays, so I'm not sure how bad subnet
zero ambiguity is anymore. But the antithesis--directed broadcast ambiguity
can still be a real problem. Consider that the broadcast address for the 10
network and the 10.255.255 subnet are the same: 10.255.255.255.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: <Dan.Thorson@seagate.com>
To: "Wright, Jeremy" <JA_WRIGHT@admworld.com>
Cc: <ccielab@groupstudy.com>; <nobody@groupstudy.com>
Sent: Friday, August 09, 2002 9:01 AM
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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