[Ilugc] tataindicom usb modem with mandriva2008.1
- From: girishvenkatachalam@xxxxxxxxx (Girish Venkatachalam)
- Date: Wed Aug 27 09:07:41 2008
On 10:09:12 Aug 25, Kenneth Gonsalves wrote:
You could have an IP 192.168.0.1 but not an IP that ends in .0 like
192.168.1.0 since both 192.168.1.255 and 192.168.1.0 are used for
broadcast.
is this a convention or a rule?
Sorry I saw this mail only now.
This is a rule. Actually it is an accident.
We are losing one extra IP for every subnet.
This is due to historical reasons. I wonder it is due to the conflict
between having all 0s or all 1s for the host part of the IP address.
I guess this was to make things easier for hardware level xor operations
or something.
1 EXOR 1 = 0
0 EXOR 0 = 0
1 EXOR 0 = 1
0 EXOR 1 = 1
So if you have an EXOR gate in your router/switch, then all 1s and all
0s both lend to fast processing.
Anyway one should read the history to figure out exactly what happened.
-Girish
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