... Great, that's another filter to add to my mailserver. Paul On 3/4/2012 6:22 AM, Guru NANOG wrote:
Common Misconception: One additional bit of IPv4 Addressing will solve world hunger
The Evil Bit (or spare unused bit) can be used to store (restore) one bit
The Left-Most bit of the 32-bit Source Address Field can be SET to Zero no matter what the original value. The Evil bit can be set IFF the Left-Most bit is **changed**.
Setting the Left-Most bit to zero **folds** this table in half. http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt
Setting the Left-Most bit to ONE would move return traffic to the upper half of the Spectrum which has vast quantities of unused /8s
Wide-spread consensus shows that TWO bits can work. Three bits folds the table to 1/8th. Governments want a 4-bit Return Prefix to their Super-Hubs for IPv6-like intercept.
The U.S.FCC is expected to issue the regulations on how Spread Spectrum Source Address Shaping will work in their licensed CPE wireless devices. There are 160-bits in the deprecated header so there are many ways to go.
One-Way Broadcast IP Addressing is now available. The Source Address Field is used for the second half of the 64-bit Destination Address. The DF (Did Flip) bit near the Evil Bit is used to note the two halves of the Destination Address have been *flipped*. NANOGers simply route 32 and then 32 after the flip based only on the Destination Field. There is no Source Address, only a channel (port).
Keywords: WRT DNSMASQ Tomato WIFI Linux CPE