Comcast NOC - Bad IPv6 Routing

Sun Feb 16 04:45:16 UTC 2020

Interesting - does a v4 traceroute follow the same path? I.e. Richmond CRAN
-> ibone Atlanta -> ibone Ashburn -> Pitt CRAN

Not having detailed knowledge of Comcast's network, I'd expect the Richmond
CRAN has a link to the ibone in Ashburn since it's fairly close (though
there may be a closer ibone location).

On Sat, Feb 15, 2020, 11:11 PM Robert Webb <rwfireguru at gmail.com> wrote:

> Could someone from Comcast NOC contact me off list.
>
> Looks like IPv6 routing from Richmond, VA to Grafton, WV has issues. IPSEC
> tunnel between gets less than 5Mbps over IPv6, switching endpoints to IPv4,
> I get the full 25Mbps down capability of the WV connection.
>
> Traceroute looks like below:
>
> Tracing route to 2001:558:6035:3c:79bb:f773:ab2:6bcd over a maximum of 30
> hops
>
>   1    <1 ms    <1 ms    <1 ms  2601:5ca:c301:4c90::1
>   2    11 ms    11 ms    10 ms  2001:558:4053:b::1
>   3     7 ms     7 ms     8 ms  2001:558:182:112::1
>   4    20 ms     9 ms     9 ms
> ae-45-ar02.staplesmllrd.va.richmond.comcast.net [2001:558:180:2005::1]
>   5    26 ms    30 ms    24 ms
> be-21508-cr02.56marietta.ga.ibone.comcast.net [2001:558:0:f787::1]
>   6    22 ms     *       23 ms
> be-1202-cs02.56marietta.ga.ibone.comcast.net [2001:558:3:12::1]
>   7     *       28 ms     *
> be-1211-cr11.56marietta.ga.ibone.comcast.net [2001:558:3:2::2]
>   8     *        *        *     Request timed out.
>   9     *        *        *     Request timed out.
>  10    36 ms     *        *     be-1402-cr02.ashburn.va.ibone.comcast.net
> [2001:558:3:2d::2]
>  11     *        *        *     Request timed out.
>  12    39 ms    43 ms    42 ms  2001:558:380:29c::2
>  13    42 ms    45 ms    50 ms  te-5-1-0-cbr01.taylor.wv.pitt.comcast.net
> [2001:558:382:fe58::2]
>  14     *        *        *     Request timed out.
>  15     *        *        *     Request timed out.
>  16     *        *        *     Request timed out.
>
>
>
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