[vox-tech] netmask question

[Erik Mullinix]

Please remember that No octet can go above 255 or it will become non
routable and may  not update in any local ARP's

Hesp

----- Original Message -----
From: "Jeff Newmiller" <jdnewmil@dcn.davis.ca.us>
To: <vox-tech@lists.lugod.org>
Sent: Sunday, March 10, 2002 9:06 AM
Subject: Re: [vox-tech] netmask question


> On Sun, 10 Mar 2002, Peter Jay Salzman wrote:
>
> > how would someone write a range of IP addresses
> >
> > 61.220.0.0 - 61.227.255.255
>
> 00111101.11011100.00000000.00000000
> 00111101.11100011.11111111.11111111
>
> If you want to write it in netmask form, you have to be able to divide it
> into two parts cleanly... the first part has to have identical bits, and
> the second part has to be all zeroes in the lower address and all ones in
> the higher end of the address range.
>
> Hmm... adding a dividing point at a power of two rollover (the first bit
> that is different)...
>
> 00111101.11011100.00000000.00000000
> 00111101.11011111.11111111.11111111
>
> 00111101.11100000.00000000.00000000
> 00111101.11100011.11111111.11111111
>
> it fits into two ranges, characterized by the first 13 bits, or
>
> 61.220.0.0/255.252.0.0
> 61.224.0.0/255.252.0.0
>
> Other arbitrary starting and ending points might not work out as two
> ranges... might have to split at more than one power of two to get the
> "same network bits, host bits roll from all zeroes to all ones" pattern.
>
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