Full Disclosure mailing list archives
Re: Does this exist ?
From: Valdis.Kletnieks () vt edu
Date: Thu, 12 Jul 2007 14:03:54 -0400
On Thu, 12 Jul 2007 12:10:46 CDT, Dan Becker said:
There simply has to be a way to represent a larger value than you transmit when you transmit.
Why does there "*have* to be" a way? There's 32 bits available, that can represent 2**32 different addresses. You want to represent more than 2**32 addresses, you'll need more bits (see IPv6). Note that it's possible to use some trickery to represent a larger *range*. For example, TCP Window Scaling, where (basically) you send a TCP option that says "Multiply all the windows by 8, or 16 or some other specified power-of-2". The problem is that the number of different possible values doesn't change. So for instance, the TCP window field in the header has 16 bits, so you can represent 65536 different values 0, 1, 2, 3, 4,... 65534, 65535. WIth a window scale of (say) 64, you can represent 0, 64, 128, 192, 255, ... 4194176, 4194240. But there's still only 65536 different values - you can no longer reresent 1-63, 65-127, and so on.
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Current thread:
- Re: Does this exist ?, (continued)
- Re: Does this exist ? Dan Becker (Jul 06)
- Re: Does this exist ? Fionnbharr (Jul 06)
- Re: Does this exist ? Matjaz Debelak (Jul 06)
- Re: Does this exist ? frode (Jul 06)
- Message not available
- Re: Does this exist ? Rob McCauley (Jul 06)
- Re: Does this exist ? Dan Becker (Jul 06)
- Re: Does this exist ? Dan Becker (Jul 06)
- Re: Does this exist ? Dan Becker (Jul 12)
- Re: Does this exist ? Valdis . Kletnieks (Jul 12)
- Re: Does this exist ? Dan Becker (Jul 12)
- Re: Does this exist ? Valdis . Kletnieks (Jul 12)
- Re: Does this exist ? Harry Behrens (Jul 14)