Spread Spectrum NANOG Operational Alert - Source Addresses with 240 to 255

Christopher Morrow morrowc.lists at gmail.com
Tue Mar 6 15:42:08 CST 2012


On Tue, Mar 6, 2012 at 4:30 PM, Guru NANOG <nanog.guru at gmail.com> wrote:
> Adding four more bits to the Left of the Source Address and setting
> those bits to 1111 (0xF) can help to start the migration to "Regions"
> and more IPv4 Addresses - Using and Re-Using legacy spectrum
> <spectrumhttp://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt>.
> The real Source Address is shifted 4 bits to the Right. The bits
> shifted off are placed in the Deprecated TOS field in the DDDD bits.
> The new TOS field has the SSSS.DDDD for the CPE.
> If a router attempts to reply or return to the Source Address it will
> hit one of the Regional Hubs. There are 16 of those.
> Agile CPE can reply in other ways to the Agile CPE that sent the
> Source Address with the 1111 bits.
> NANOG operators may want to study the evolution of 6to4 (2002:IPv4:0000) to
> 6RD (IPv4:IPv4) which tunnels using Re-Used legacy 32-bit addresses.
> The Legacy 32-bit Address Space will likely be around a long long time
> and be reused in many ways.
> That may increase the market value of /8s. Brokers are now selling /8s
> on the open market.
> http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt
> <spectrumhttp://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt>
> 16 /8s for "Future use" - it looks like the "Future" has arrived
> 240/8  Future use                                     1981-09
>          RESERVED    [15]
>                                   ...
>   255/8  Future use                                     1981-09
>             RESERVED  [15]
> http://tools.ietf.org/html/draft-gundavelli-v6ops-community-wifi-svcs
> <http://tools.ietf.org/html/draft-gundavelli-v6ops-community-wifi-svcs-014.13.>
> 014.13. <http://tools.ietf.org/html/draft-gundavelli-v6ops-community-wifi-svcs-014.13.>
> Overlapping IPv4 Address Support Wi-Fi Service Provider may segment the
> network into regions. Two regions may use overlap IPv4 address space. This
> is particularly important when the Internet is transitioning to IPv6. The
> Wi-Fi SP may not have enough unique public IPv4 addresses to globally
> address large number of Wi-Fi device.

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