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 _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf