Comcast NOC - Bad IPv6 Routing

Sun Feb 16 12:58:16 UTC 2020

IPv4 looks like I would expect traversing Charlottesville, VA then to
Ashburn, VA. This is what I am used to seeing.

Tracing route to 73.214.xxx.xxx
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2     7 ms    11 ms     9 ms  96.120.80.37
  3     7 ms     9 ms     7 ms  69.139.186.137
  4    18 ms    16 ms    17 ms
ae-45-ar02.charlvilleco.va.richmond.comcast.net [69.139.206.9]
  5    20 ms    18 ms    20 ms  be-21508-cr02.ashburn.va.ibone.comcast.net
[68.86.91.53]
  6    24 ms    24 ms    25 ms  be-7922-ar01.mckeesport.pa.pitt.comcast.net
[68.86.91.26]
  7    31 ms    29 ms    29 ms  162.151.64.58
  8    30 ms    30 ms    30 ms  te-5-1-1-cbr01.taylor.wv.pitt.comcast.net
[96.108.132.94]
  9    36 ms    36 ms    40 ms  c-73-214-26-90.hsd1.wv.comcast.net
[73.214.xxx.xxx]

IPv6 routing still horrible this morning.

On Sat, Feb 15, 2020 at 11:45 PM Ross Tajvar <ross at tajvar.io> wrote:

> 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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