[150773] in North American Network Operators' Group
RE: Spread Spectrum IP Addressing - SOURCE Address Field
daemon@ATHENA.MIT.EDU (Keith Medcalf)
Sat Mar 3 16:14:36 2012
Date: Sat, 03 Mar 2012 14:13:33 -0700
In-Reply-To: <CALWgkyoYSDpYH5KZsqezerZh2xPEyV3AGr+bA704sGEEOPCV8g@mail.gmail.com>
From: "Keith Medcalf" <kmedcalf@dessus.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Is it April already? I though April Fools Day wasn't until next month.
I did, I did. I did see a snake-oil salesman!
---
()=A0 ascii ribbon campaign against html e-mail
/\=A0 www.asciiribbon.org
> -----Original Message-----
> From: Guru NANOG [mailto:nanog.guru@gmail.com]
> Sent: Saturday, 03 March, 2012 12:34
> To: nanog@nanog.org
> Subject: Spread Spectrum IP Addressing - SOURCE Address Field
> ROTATED|shifted? Left 2 Bits
>
> Common Misconception
>
> With Spread Spectrum IP Addressing the 32-bit Source Address Field is
> Shifted LEFT 2-bits by the originator of the packet.
>
> That Folds the IPv4 Legacy Address Space into 1/4th tsize table
>
> The lost 2-bits are stored in the Right-Most 2 bits of the 32-bit
> field and in other places in the IPv4 Header
>
> The Destination can easily recover the Source Address - if the proper
> algorithms are in use
>
> Responses blindly sent back to the shifted Source Address may fall
> into agile hands or not
>
> With the advanced Spread-Spectrum techniques, additional addressing
> bits are created from the noise intentionally stored in the Right-Most
> 2 bits
>
> NANOG Operators buying /8s or /6s may want to look at the
> Spread-Spectrum CODE in the Linux-based CPE Routers
>
> The following table is deprecated and 1/4th the size:
> http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt
>
> With Spread-Spectrum collisions and mis-directions are OK and expected bu=
t
> other
> techniques ensure the packets get to the right place.
>
> http://NANOG.GURU
