I retract what I wrote in a previous message about DFZ routers
needing to look at 64 bits of the packet's destination address.
I misunderstood the text:
LIR's may assign blocks in the range of /48 to /64 to end sites.
All assignments made by LIR's should meet a minimum HD-Ratio of
.25.
* /64 - Site needing only a single subnet.
* /60 - Site with 2-3 subnets initially.
* /56 - Site with 4-7 subnets initially.
* /52 - Site with 8-15 subnets initially.
* /48 - Site with 16+ subnets initially.
from:
http://lists.arin.net/pipermail/ppml/2007-August/008521.html
as referring to RIRs.
This proposal doesn't lead to any greater burden on FIBs of DFZ
routers, but I still think the /48 PI end-user assignments are
pretty hard on the routers.
Each VoIP call between hosts in two /48 prefixes with 16 DFZ routers
en-route involves those routers collectively working through this
many bits:
50 * 2 * 48 * 16 = 76,800 bits!
- Robin
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