Gert Doering wrote: As a side note: nothing prevents you from making better usage of a /32 - 7100 users is the minimum value you have to document to get a bigger block. Depending on the way the internal network hierarchy works (if it has few levels, and all entities at one level are similarily sized) it is perfectly allowed to utilize 20.000 /48s or more :-) - it all depends on your network structure.

Pekka, I don't know how you came with these figures but Gert is absolutely right. The HD of a dial pool or tunnel pool depends on two things: 1. The HD of the hardware itself, as there are some strong operational incentives to allocate a block per device, such as allocating a block of 256 sites to an access server that has only 192 modems. 2. The network structure. For a dial pool that size, there is absolutely no need for more than one level of aggregation (that would be the pop level). The device with the worst HD I have used is Cisco AS5400, it has 648 modems and it is temping to allocate a block of 1,024 sites to it. That device itself has a HD of 0.934. Then you have the pop aggregate. In a single pop, the worst you can have is 33 of these boxes. This is 21384 sites on a /32, which is a HD of 0.899. On a 3-pop setup, the worst you would have 9 boxes per pop, which still is 17,496 sites and a HD of 0.881. This is the absolute worst case scenario. The bottom line is that a typically organized /32 dial pool has up to 40k sites. Michel.