- Original Message -
From: Matthew Seaman [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Tuesday, November 12, 2002 3:45 PM
Subject: Re: ipfw matching (revisited)
On Tue, Nov 12, 2002 at 03:06:42PM +0100, Mark wrote:
Ok, I constructed the following IP:mask for ipfw to match:
202.43.64.0:255.255.191.0
This is supposed to match the range 202.43.64.xx to
202.43.127.xx
Close, but no cigar. You want:
202.43.64.0:255.255.192.0 also known as 202.43.64.0/18
^
That matches the addresses from 202.43.64.0 to 202.43.127.255
inclusive.
Thanks for the explanation. Yes, 191 (1011) would only have bit 6
variable; indeed, I needed 192 (1100), to keep the lower 6 bits
variable. It is clear to me now.
Good thing I asked! :)
- Mark
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