Mailing List Archive: ipv6 packet loss in DEN for comcast?

ipv6 packet loss in DEN for comcast?

Apr 18, 2023, 12:55 PM

Post #1 of 3 (184 views)

I'm seeing heavy packet loss within DEN metro for comcast on ipv6 (but
not ipv4).

mtr to my mail host follows. packet loss the same hop for any site on
the internet i try to reach via ipv6.

anyone else seeing issues?

HOST: localhost. Loss% Snt
Last Avg Best Wrst StDev
1.|-- xxxxxxxxxxxxxxxxx 0.0% 10 4.1 4.8 2.5 12.9 2.9
2.|-- xxxxxxxxxxxxxxxxx 0.0% 10 14.2 15.4 13.1 20.2 2.2
3.|-- ae-251-1203-rur01.monument.co.denver.comcast.net 0.0% 10 15.9 20.7 13.2 36.0 8.2
4.|-- ae-12-ar01.denver.co.denver.comcast.net 0.0% 10 23.5 20.6 14.9 32.9 5.4
5.|-- 2001:558:1c0:1058::1 40.0% 10 15.4 18.1 14.8 27.3 4.8
6.|-- be-36031-cs03.1601milehigh.co.ibone.comcast.net 90.0% 10 15.8 15.8 15.8 15.8 0.0
7.|-- be-1314-cr14.1601milehigh.co.ibone.comcast.net 40.0% 10 17.8 17.2 16.1 17.8 0.6
8.|-- be-303-cr14.champa.co.ibone.comcast.net 70.0% 10 18.9 21.1 18.4 26.0 4.2
9.|-- be-1214-cs02.champa.co.ibone.comcast.net 60.0% 10 16.8 17.3 16.7 17.8 0.6
10.|-- be-1212-cr12.champa.co.ibone.comcast.net 30.0% 10 17.2 19.4 15.7 25.5 3.3
11.|-- be-301-cr11.sunnyvale.ca.ibone.comcast.net 0.0% 10 42.2 42.1 39.6 43.8 1.3
12.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
13.|-- be-3202-pe02.529bryant.ca.ibone.comcast.net 0.0% 10 42.6 43.4 40.7 48.3 2.3
14.|-- 2001:559::14e 0.0% 10 42.7 43.5 41.3 48.8 2.1
15.|-- mail.dragon.net 0.0% 10 42.1 42.7 40.7 47.5 1.9

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Re: ipv6 packet loss in DEN for comcast? [ In reply to ]

outages at outages

Apr 18, 2023, 1:00 PM

Post #2 of 3 (184 views)

Permalink

There is no loss that persists through to the endpoint in that trace. This
is standard control plane rate limiting at intermediate hops.

https://archive.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf

On Tue, Apr 18, 2023, 12:56 Paul Ebersman via Outages <outages@outages.org>
wrote:

> I'm seeing heavy packet loss within DEN metro for comcast on ipv6 (but
> not ipv4).
>
> mtr to my mail host follows. packet loss the same hop for any site on
> the internet i try to reach via ipv6.
>
> anyone else seeing issues?
>
> HOST: localhost. Loss% Snt
> Last Avg Best Wrst StDev
> 1.|-- xxxxxxxxxxxxxxxxx 0.0% 10 4.1
> 4.8 2.5 12.9 2.9
> 2.|-- xxxxxxxxxxxxxxxxx 0.0% 10 14.2
> 15.4 13.1 20.2 2.2
> 3.|-- ae-251-1203-rur01.monument.co.denver.comcast.net 0.0% 10
> 15.9 20.7 13.2 36.0 8.2
> 4.|-- ae-12-ar01.denver.co.denver.comcast.net 0.0% 10
> 23.5 20.6 14.9 32.9 5.4
> 5.|-- 2001:558:1c0:1058::1 40.0% 10 15.4
> 18.1 14.8 27.3 4.8
> 6.|-- be-36031-cs03.1601milehigh.co.ibone.comcast.net 90.0% 10
> 15.8 15.8 15.8 15.8 0.0
> 7.|-- be-1314-cr14.1601milehigh.co.ibone.comcast.net 40.0% 10
> 17.8 17.2 16.1 17.8 0.6
> 8.|-- be-303-cr14.champa.co.ibone.comcast.net 70.0% 10
> 18.9 21.1 18.4 26.0 4.2
> 9.|-- be-1214-cs02.champa.co.ibone.comcast.net 60.0% 10
> 16.8 17.3 16.7 17.8 0.6
> 10.|-- be-1212-cr12.champa.co.ibone.comcast.net 30.0% 10
> 17.2 19.4 15.7 25.5 3.3
> 11.|-- be-301-cr11.sunnyvale.ca.ibone.comcast.net 0.0% 10
> 42.2 42.1 39.6 43.8 1.3
> 12.|-- ??? 100.0 10 0.0
> 0.0 0.0 0.0 0.0
> 13.|-- be-3202-pe02.529bryant.ca.ibone.comcast.net 0.0% 10
> 42.6 43.4 40.7 48.3 2.3
> 14.|-- 2001:559::14e 0.0% 10 42.7
> 43.5 41.3 48.8 2.1
> 15.|-- mail.dragon.net 0.0% 10
> 42.1 42.7 40.7 47.5 1.9
>
>
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Re: ipv6 packet loss in DEN for comcast? [ In reply to ]

outages at outages

Apr 18, 2023, 1:08 PM

Post #3 of 3 (184 views)

Permalink

hugo> There is no loss that persists through to the endpoint in that
hugo> trace. This is standard control plane rate limiting at
hugo> intermediate hops.

Normally I'd agree, except I am also seeing slow web, slow downloads,
etc, all consistent with heavy packet loss.

mtr is the convenient tool but I wouldn't be asking if that were the
only symptom.
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