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Provider-Independent Addressing

Provider-Independent Addressing. PI Multihoming. One possible answer to the multihoming/multiple address problem is the use of addresses determined by geography. Each site uses the location of its ISP demarc to determine its PI address space - put your GPS on top of your router.

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Provider-Independent Addressing

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  1. Provider-Independent Addressing

  2. PI Multihoming • One possible answer to the multihoming/multiple address problem is the use of addresses determined by geography. • Each site uses the location of its ISP demarc to determine its PI address space - put your GPS on top of your router.

  3. PI Address Calculation • Lat/Lon each converted to a 22-bit binary number 40.0433N = 0001110001111001101010 105.2781W = 1011010100100010101101 • Two values interleaved, latitude first 0100 0111 1011 0001 0010 1110 1000 0110 1100 1101 1001 4 7 b 1 2 e 8 6 c d 9 X47b:12e8:6cd9::/48 • X because this scheme is not yet approved, but the expectation is that 1 will be used.

  4. PI Address Calculation • Why interleave? So that as the prefix gets longer, the area included in the prefix gets smaller: bits degrees nominal square scope sites -------------------------------------------------------------------- 4 -> 90.00000 10000 km octant 8 -> 22.50000 2500 km expanse 12 -> 5.625000 600 km zone 16 -> 1.406250 150 km region 20 -> 0.3515625 40 km metro 16777216 24 -> 0.087890625 10 km city 1048576 28 -> 0.02197265625 2.5 km locality 65536 32 -> 0.0054931640625 600 m neighborhood 4096 36 -> 0.001373291015625 150 m block 256 40 -> 0.00034332275390625 40 m lot 16 44 -> 0.0000858306884765625 10 m site 1

  5. PI Address Calculation • If all the ISPs in an area meet at a local exchange, they may be able to aggregate PI addresses to some degree. • But using PI will inevitably mean that more prefixes are carried in the default-free zone (DFZ) at the core of the Internet.

  6. PI Multihoming 1528:8653:2800::/39 ISP2 (WestCo) IBM 1528:8653:294C::/48 ISP1 UUnet SOX 1528:8653:28FE::/48 GE 1528:8653:2905::/48 Ford 1528:8653:29A6::/48

  7. PI Multihoming • Proposed format: draft-hain-ipv6-pi-addr-02.txt • Usage discussion: draft-hain-ipv6-pi-addr-use-02.txt • Abilene PIA background and calculator: http://loadrunner.uits.iu.edu/~neteng/ipv6/pi/pi.html • Remember, this is NOT a standard yet!

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