[Linux-Anyway] Re: Virtual host going through isp
- From: horrorvacui@xxxxxxx
- To: Linux-Anyway@xxxxxxxxxxxxx
- Date: Tue, 4 Mar 2003 01:44:26 +0100
On Mon, 3 Mar 2003 23:00:31 +0100
Godwin Stewart <gstewart@xxxxxxxxxxx> wrote:
>
> And Thus Spake horrorvacui@xxxxxxx (on Mon, 3 Mar 2003 22:55:12 +0100):
>
> > I think this range is 172.16.0.0/20 in CIDR notation, but I'm not sure
> > (and I'm too lazy to calculate now).
>
> Nope, it's 172.16.0.0/12 - meaning that only the left-most 12 bits are
> '1' in the netmask.
>
> > By the way, Godwin, I think it's 10.0.0.0/24. Sorry about the
> > hair-splitting, but that's just how I am.
>
> Let me stick the hairs back together again. It *is* 10.0.0.0/8 :)
>
Damn, I just love the moments when I pretend to be clever and deservedly
land on my nose. Yep, stick 'em back together. Excerpt from RFC 1918:
<quote>
3. Private Address Space
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
We will refer to the first block as "24-bit block", the second as
"20-bit block", and to the third as "16-bit" block. Note that (in
pre-CIDR notation) the first block is nothing but a single class A
network number, while the second block is a set of 16 contiguous
class B network numbers, and third block is a set of 256 contiguous
class C network numbers.
</quote>
As you might have guessed, I counted the hosts bits and confused them with
the CIDR netmask value, because what I had in mind was something in the
line of 16, 20 and 24-bit blocks the RFC talks about. I guess Microsoft
owes me a refund. Alternatively, god might still owe me a brain (in which
case He should be wary to enter a legal dispute with Microsoft over that,
and rather settle to accept responsibility to limit losses).
The last hair.. er, straw I can spl.. grip to save my ego is that it's not
2^24, rather 2^24-2 useable addresses for 10/8. Gotcha! Heh! Take that!
;-)
Cheers
--
Horror Vacui
Registered Linux user #257714
Go get yourself... counted: http://counter.li.org/
- and keep following the GNU.
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