On 2/9/2011 3:17 PM, George Bonser wrote:
Hmm, I am not aware of Comcast (or any other large MSO) doing any NAT
on
large scale. Having said that almost all of the DSL customers in the
US
are being NAT'ed, but on the edge device (DSL modem) rather than in
the
core.
--
Scott Helms
Vice President of Technology
ISP Alliance, Inc. DBA ZCorum
How many instances of 10/8 did they say they were running? I was behind
a NAT when I had Comcast service. I am behind a NAT currently with my
AT&T service.
Note that the NAT was done on the "cable modem" in both cases and not
further in to their network.
10/8 is the management network on my cable modem. The cable modem
bridges your wan 'real' ip(s) through to your PC or router. At least
that's how Suddenlink does it here. The customer is normally 'locked
out' of the cable modem, unlike a dsl modem. The largest NATs are
presumably w/mobile carriers. I've never been behind NAT (except one I
controlled) on a consumer dsl or cable link in the US.
Ken
That said, from my reading of some
industry large scale NAT devices (the A10 AX series is one which I am
familiar with), they do things such as full cone NAT so it will still
work with many applications that might break with conventional overload
dynamic NAT.
--
Ken Anderson
Pacific Internet - http://www.pacific.net
