[ale] [OT] AT&T/UVerse going to carrier grade NAT?

[Derek Atkins]

Stephen Haywood <stephen at averagesecurityguy.info> writes:

> You can do a /30, which would mean the customer gets one IP.

You're assuming you give the customer a subnet.  You don't have to do
that.

You can do what Comcast residential does which is have a /22 (IIRC)
shared network amongst all of the area and gives out singleton addresses
to each customer on the network.  So you get a single IP as part of the
/22 for your registered host.  You're broadcast network is your entire
local loop, however the cablemodem does blocking to make sure you don't
see your neighbor's traffic.  Your gateway is effectively the head-end;
the cablemodem acts as a bridge.

Cable companies have been operating that way for years!  Why dole out
four IPs per customer when you can just give out one?

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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