Re: [Bloat] cake + ipv6

[Daniel Sterling <sterling.daniel@gmail.com>]

This is a very good question, I will stare at "iftop" (and check the
xbox's network settings, if I can), the next time I notice it's
updating.

The report from my "users" :) was that pausing xbox updates solved
their video streaming issues -- but, it may be that there was other
network traffic or that multiple systems were doing updates, and the
update they paused gave back enough bandwidth for their streams.

I will look at traffic summore and let you know if I was mistaken
about the xbox. It is now using ipv6 for at least some updates, I do
know that much for certain, but hopefully I'm wrong about it using too
many v6 addresses.

Jonathan, thanks for the tips re: using ports or remote addresses --

Hmm, I don't know -- is it possible to identify (and thus classify)
plain old bulk downloads, as separate from video streams? They're both
going to use http / https (or possibly QUIC) -- and they're both
likely to come from CDN networks... I can't think of a simple way to
tell them apart.

Is this enough of a problem that people would try to make a list of
netblocks / prefixes that belong to video vs other CDN content?

I do notice video streams are much more bursty than plain downloads
for me, but that may not hold for all users.

That is, for me at least, a video stream may average 5mbps over, say,
1 minute, but it will sit at 0mbps for a while and then burst at
20mbps for a bit.

I can't think of a way to mark such traffic though. Is there a place
where such complex, custom rules for marking packets would sit?
Perhaps a userspace daemon that looks at traffic with pcap?

Thanks,
Dan

On Mon, Aug 17, 2020 at 10:55 PM Kenneth Porter <shiva@sewingwitch.com> wrote:
>
> --On Monday, August 17, 2020 10:52 PM -0400 Daniel Sterling
> <sterling.daniel@gmail.com> wrote:
>
> > As I'm sure you know ipv6 addresses are essentially random on the
> > internal LAN as compared to v4 -- a box can grab as many v6 addresses
> > as it wants, and I don't believe my linux router can really know which
> > box is using which address, can it?
>
> Is this the usual IPv6 allocation by autoconfig or is the Xbox grabbing
> extra addresses deliberately to break flow isolation? It should only
> advertise one public address for its updates.
>
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat