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

[Justin Goldberg]

This is bad news for AT&T customers, as their customers will be
double-NATted. Perhaps a workaround could be allowing the customers to
manage their allowed port range/firewall/NAT, or having a customer put
their LAN onto AT&T's LAN, if they trust AT&T to not capture packets.

There's a really interesting google techtalk where ipv4 to v6 is
discussed. I don't have the link but I do remember it was in japan and
sponsored by docomo. One of the workarounds discussed is that you have
x number of customers behind a single public ip. I believe this is
"CGN". Obviously this wouldn't work for well-known ports that multiple
customers want to use.

Also I've seen on dslreports that ipv6 is working in some Uverse areas
by modding the firmware.


On 6/10/12, Sean McNealy <sean.mcnealy at gmail.com> wrote:
> Nobody's mentioned IPv6 yet in this thread. I know it's always just
> over the horizon, but apparently Uverse is planning on rolling that
> out this year, or at least the firmware updates to the modems/gateways
> (I can't tell if the URL has my session info in there, so you get to
> search for it yourself).
>
> On Fri, Jun 8, 2012 at 1:29 PM, Brian Mathis
> <brian.mathis+ale at betteradmin.com> wrote:
>> On Fri, Jun 8, 2012 at 3:57 PM, Derek Atkins <warlord at mit.edu> wrote:
>>> 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
>>
>>
>>
>> I would guess that most people who want a static IP are businesses, so
>> to simplify the product line and support they use small subnets
>> instead of schemes like this.  In this sense, the telecom networks
>> seem to be more "pure" than the cable ones.
>>
>>
>> ❧ Brian Mathis
>>
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