From: Dan.Thorson@xxxxxxxxxxx
Date: Fri Aug 09 2002 - 15:41:27 GMT-3
Well, in your example of net-10 with a /24, the IP address
10.255.255.255
could be either of the following
1) the all-subnets-directed broadcast (all subnets in the classfull network
10/8)
or
2) the subnet-directed broadcast for network 10.255.255.0/24
So the reason a subnet portion of all 1's is bad is pretty easy to see
(which is it, all subnets, or just one?).
On the other hand
10.0.0.0
in one case is the network number for the class-full network 10/8, but is
also the network number for the 10.0.0/24 subnet. This could lead to some
routing confusion, I suppose, if you don't keep track of subnet masks....
... and as has been said previously, modern [Cisco] network equipment can
keep track of the difference between these two routes (with ip subnet-zero
enabled).
danT
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Dan Thorson - Seagate Technology, LLC
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SeaTel 8-402-8293
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