> > A number of IETF documents(*) state that there are some service providers > that place a NAT box in front of their entire network, so all their > customers get private addresses rather than public address. > It is often stated that these are primarily cable-based providers. > > I am trying to get a handle on how common this practice is. > No one that I have asked seems to know any provider that does this, > and a search of a few FAQs plus about an hour of Googling hasn't > turned up anything definite (but maybe I am using the wrong keywords ...).
We nat a portion of our residentail users -- not all of our network. As I recall our current nat pools are comprised of a /21 --sjk