Re: Spotty internet connection

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On Fri, Feb 3, 2017 at 12:08 PM, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
> for Comcast/Xfinity, I'm using a Arris SB6183 that I got at Costco.   this
> is a simple modem/bridge, so /my/ router behind it gets the public IP.

Note that some residential ISPs may not offer "naked" Internet, and/or
won't allow you to bring your own device (BYOD).  At least in my area,
there are only two options for residential Internet; cable-based via
Comcast, and DSL-based via AT&T.  I used to routinely switch back and
forth between the two, to play them against each other for the best
rates.  However, I had to give up on AT&T because they stopped
offering a "naked" service.  That is, when I was using them, I had the
most basic DSL modem, that literally did nothing except provide me
with a public Internet IP and the service.  Last I talked to them, I
could only use their service with their fancy all-in-one devices, that
are both a DSL modem and gateway/router/wireless AP.  I already have
all that infrastructure in my house, and I trust my ability to manage
it more than I trust the blackbox firmware that AT&T provides.

Going from memory, that all-in-one DSL service did give me a public
IP, but the device itself implemented NATing, so it looked like I was
getting a private IP.  There *may* have been a way to remove most of
the functionality of the all-in-one device ("DMZ mode" or something
like that); it's been discussed pretty heavily on the DSLReports
Forums.  (But, either way, even ignoring the technical grievances with
their service, AT&T's prices are higher and speed tiers lower than
Comcast's.)

TL;DR: (1) some ISPs may not allow BYOD; (2) if it looks like your ISP
is giving you a private IP, dig a little deeper, it could simply
appear that way due to the way the ISP configures the assigned device.
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