Need Comcast IPv6 routing assistance please

[David Sotnick <sotnickd-nanog () ddv com>]

Hello NANOG,

Could someone from Comcast IPv6 routing team please contact me directly? I
am both a business and residential comcast customer and my employer is a
Level(3) HSIP customer at multiple sites.

I'm seeing *consistent* 46.1% packet loss between Comcast Res/Bus services
in Northern CA and Pixar (Level 3 customer) also in Northern CA. I have
ticket open with Level (3) but the problem appears to be on Comcast's
network.

Sample trace:

                                       My traceroute  [v0.85]
ipv6testhost.ddv.com (::)
 Mon May 23 10:56:05 2016
Keys:  Help   Display mode   Restart statistics   Order of fields   quit
                                                           Packets
      Pings
 Host                                                    Loss%   Snt   Last
  Avg  Best  Wrst StDev
 1. 2601:647:280:23::1                                    0.0%   464    0.6
  0.4   0.3   8.7   0.4
 2. 2001:558:4000:3d::1                                   0.2%   463   13.0
 10.3   8.2  27.4   2.1
 3. te-0-7-0-5-sur03.sanrafael.ca.sfba.comcast.net       10.2%   463    9.6
 10.7   8.5  34.8   2.4
 4. be-207-rar01.rohnertpr.ca.sfba.comcast.net           44.7%   463   10.6
 11.7   9.4  25.9   2.1
 5. he-0-18-0-0-ar01.santaclara.ca.sfba.comcast.net      51.6%   463   15.2
 14.1  12.0  26.2   1.9
 6. 2001:1900:4:3::439                                   46.0%   463   13.3
 14.4  11.8  50.2   3.6
 7. vl-80.edge1.SanJose1.Level3.net                      44.9%   463   12.1
 13.9  11.7  28.5   2.3
 8. vl-4045.edge5.LosAngeles.Level3.net                  45.4%   463   21.2
 21.5  19.2  39.4   2.6
 9. vl-4044.bar1.LasVegas1.Level3.net                    46.4%   463   24.9
 27.7  24.4  88.3   6.8
10. vl-5.car1.LasVegas1.Level3.net                       46.2%   463  104.3
 46.3  24.5 318.2  48.0
11. PIXAR-ANIMA.car1.LasVegas1.Level3.net                44.9%   463   27.6
 27.4  25.0  37.7   2.1
12. 2620:79:0:b04d::249                                  45.1%   463   46.4
 48.9  46.0 114.2   4.9

And pings back from Pixar:

Type escape sequence to abort.Sending 500, 100-byte ICMP Echos to
2601:647:0:1900:242:DEA1:FEC9:FFAE, timeout is 2 seconds:
Packet sent with a source address of
2620:79:0:B04D::249%internet.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!..!.!!!!!!!!!!!!..!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!..!!!!!.!!!!!!!!!!!!!!!!!!!!!!!..!.!!!!!!!!!!!!!!!!!!..!!!!!!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!..!!.!!!!..!!!!!!!!!...!!!!!!!!!!!!!....!!!!!!!!..!!!!!!!!!....!!!!!..!!!!!!!!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!Success rate is 90 percent (452/500), round-trip min/avg/max =
12/30/68 ms

Any help really appreciated as you can imagine how painful remote access
for our employees with Comcast connections into Pixar over IPv6 is right
now.

Many Thanks,
David