[nsp] Ip address on interface

[Michael Loftis]

Because in the first instance, with a mask of 255.255.255.0 the xx.xx.xx.0 
and xx.xx.xx.255 addresses are reserved, the first for the subnet 
identifier, and hte last as the broadcast.  In your second example with a 
mask of 255.255.0.0 the xx.xx.0.0 and xx.xx.255.255 addresses are reserved 
for the same reasons, the .0.0 being the subnet identifier, and the 
.255.255 being the broadcast address.

All bits as 0's in the host portion identify the subnet, all 1's in the 
host portion identifies the broadcast address.  They aren't available for 
assignment as regular IP addresses because they are reserved for these 
special uses.

--On Wednesday, March 05, 2003 5:17 PM +0100 Roberto Paoletti 
<rob.paol at iol.it> wrote:

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> Hi all,
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> i'd like to do a question, i configured on my router an ip address on the
> serial interface and i assigned this :
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> ip address 192.168.10.0 255.255.255.0
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> and the response is Bad Mask....that's all right.
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> I don't know why if i assigned this :
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> ip address 192.168.10.0 255.255.0.0
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> it accept this command.
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> Is it maybe a stupid question?????
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> Is it correct????
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> Regards,
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> Thanks
>
> Roberto Paoletti
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>