Re: Muddled explanation of classed vs. classless IPs
Quoting Colin Cashman (ccashman@mediaone.net):
> > I don't know what all this is about. Still, it woke me up.
You've made me feel guilty. I would have expressed myself better
if I'd known you were going to this trouble.
> I was just reading this in one of the TCP/IP books I have, so I'll
> take a stab at explaining it (and let somebody else explain the
> errors).
> The host portion always comes first. Somebody might assigned you the
> block of IP addresses 45.67.0.1 -
^
You'd need 0 as well (i.e. the network address).
> Class B networks had a 16-bit host and a 16-bit network value, such
> as 45.67.xxx.xxx (in the example in
^^
This would be higher (128--191).
> Class C networks had a 24-bit host and an 8-bit network value
> (45.67.112.xxx).
^^
And higher still (192--224).
I was surprised, when I was browsing in a bookshop recently, that
New Riders' "Planning for Windows 2000" seemed to know no more
than this. Nothing about classless IP.
Thanks,
--
Email: d.wright@open.ac.uk Tel: +44 1908 653 739 Fax: +44 1908 655 151
Snail: David Wright, Earth Science Dept., Milton Keynes, England, MK7 6AA
Disclaimer: These addresses are only for reaching me, and do not signify
official stationery. Views expressed here are either my own or plagiarised.
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