Bufferbloat and the pandemic was: V6 still not supported

Michael Thomas mike at mtcc.com
Wed Mar 23 20:31:39 UTC 2022

On 3/23/22 1:08 PM, John Levine wrote:
> It appears that Michael Thomas <mike at mtcc.com> said:
>> anything that ISP can do if they don't supply the ÇPE? What percentage
>> of providers do supply the CPE in the form of cable and dsl modems, etc,
>> that they could solve the problem with a swap out?
> In the US at least, although cable customers can use their own DOCSIS modem and
> a router, most don't.  All the Comcast customers I know have a combo box that
> is a modem, router, hotspot, and telephone adapter.  It has full native IPv6
> support, of course.  I poked at one and found that some functions like port
> forwarding are only managed remotely by logging into the Xfinity website.
> DSL and fiber modems aren't standard like DOCSIS so you have to use the telco's.
> Anecdotally, when I've rented apartments in the UK and France they all had
> provider CPE too.
I just googled and it seems that DOCSIS 3.1 mandates shapers, though it 
allows the MSO to turn it on or off. DSL of course is the worst of the 
bunch and since there is no cablelabs equivalent is a free for all. My 
ISP is rolling out fiber so it will be interesting to find out whether 
they roll out modems that implement shapers. My guess: no. Considering 
they aren't changing the traffic tiers from DSL, sounds like they're a 
prime candidate for taking lots of "my internet is slow" calls.


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