Hi Cameron, On Sun, 2011-11-06 at 21:31 -0800, Cameron Byrne wrote: > > There are a variety of reasons. Most prominent is that if the issue > is lack of IPv4 addresses (public and private), dual-stack does not > solve this problem, each device still gets an IPv4 address. Another > major issue is that in GSM/UMTS (3GPP pre-release 9), having > dual-stack means having 2 attachments to the network, one for v4 and > one for v6. Most mobile providers pay for most of their network kit > in terms of these attachments known as PDP. Consequently, dual-stack > doubles the of the packet-core network. If we take the licensing and > contractual parts out of the equations, double the attachments means > double the signalling and mobility events ... resulting in double the > CPU / Memory / blah ...
That'll probably explain it... Thanks. :) > LTE does not have the dual attachment problem since there is the > concept of having v4 and v6 in one attachment, but it does not change > the fact that there are not enough IPv4 addresses to go around, > especially from a strategic planning perspective (let's design this > once for 5 to 10+ year life ...) If only the UK was as far ahead on LTE as the US! Tom
