Comcast IPv6 issues..?

Stephen Frost sfrost at snowman.net
Wed Dec 3 20:12:44 UTC 2014


Hey all,

  Getting delays and seeing some pretty funky routes inside Comcast.
  All traces start from Ashburn, VA (2001:4830:167b::) and go to
  Chicago, IL (2610:150:4b0f::).

  Coming from Occaid/SIXXS (over a tunnel) through HE.net and have seen:

Ashburn -> San Jose -> New York -> Chicago
-----
 3  sixxs-asbnva-gw.customer.occaid.net (2001:4830:e6:7::2)  9.955 ms  10.583 ms  10.17 ms
 4  iad0-b0-ge2.hotnic.net (2001:4810:0:100::1)  9.726 ms  11.004 ms  9.956 ms
 5  10gigabitethernet2-2.core1.ash1.he.net (2001:504:0:2::6939:1)  10.069 ms  10.674 ms  12.465 ms
 6  2001:559::db5 (2001:559::db5)  94.83 ms  95.593 ms  94.768 ms
 7  pos-2-2-0-0-cr01.sanjose.ca.ibone.comcast.net (2001:558:0:f58d::1)  96.779 ms  99.591 ms  94.964 ms
 8  he-0-7-0-0-cr01.newyork.ny.ibone.comcast.net (2001:558:0:f5ba::2)  89.969 ms  91.143 ms  92.507 ms
 9  he-0-11-0-0-cr01.350ecermak.il.ibone.comcast.net (2001:558:0:f5b8::2)  97.411 ms  88.731 ms  87.457 ms
10  he-0-10-0-0-pe04.350ecermak.il.ibone.comcast.net (2001:558:0:f8cc::2)  87.444 ms  88.756 ms  87.505 ms
11  2001:550:2:2::32:2 (2001:550:2:2::32:2)  89.812 ms  88.774 ms  87.558 ms
-----

Ashburn -> New York (but with lots of latency..) -> Chicago
-----
 3  sixxs-asbnva-gw.customer.occaid.net (2001:4830:e6:7::2)  9.549 ms  10.652 ms  10.107 ms
 4  iad0-b0-ge2.hotnic.net (2001:4810:0:100::1)  9.975 ms  11.044 ms  10.009 ms
 5  10gigabitethernet2-2.core1.ash1.he.net (2001:504:0:2::6939:1)  17.423 ms  11.05 ms  12.27 ms
 6  2001:559::db5 (2001:559::db5)  95.197 ms  95.968 ms  94.793 ms
 7  he-2-6-0-0-cr01.ashburn.va.ibone.comcast.net (2001:558:0:f8d2::1)  105.158 ms  101.428 ms  94.993 ms
 8  he-0-7-0-0-cr01.newyork.ny.ibone.comcast.net (2001:558:0:f5ba::2)  89.735 ms  90.266 ms  92.577 ms
 9  he-0-11-0-0-cr01.350ecermak.il.ibone.comcast.net (2001:558:0:f5b8::2)  89.813 ms  92.963 ms  92.383 ms
10  he-0-10-0-0-pe04.350ecermak.il.ibone.comcast.net (2001:558:0:f8cc::2)  87.401 ms  88.15 ms  87.085 ms
11  2001:550:2:2::32:2 (2001:550:2:2::32:2)  122.387 ms  124.288 ms  122.409 ms
-----

Ashburn -> Chicago -> New York -> Chicago
-----
 3  sixxs-asbnva-gw.customer.occaid.net (2001:4830:e6:7::2)  9.926 ms  10.183 ms  9.978 ms
 4  iad0-b0-ge2.hotnic.net (2001:4810:0:100::1)  9.961 ms  11.37 ms  9.973 ms
 5  10gigabitethernet2-2.core1.ash1.he.net (2001:504:0:2::6939:1)  9.95 ms  18.258 ms  9.951 ms
 6  2001:559::db5 (2001:559::db5)  94.959 ms  96.413 ms  95.001 ms
 7  he-1-10-0-0-cr01.chicago.il.ibone.comcast.net (2001:558:0:f552::1)  92.457 ms  92.964 ms  89.965 ms
 8  he-0-7-0-0-cr01.newyork.ny.ibone.comcast.net (2001:558:0:f5ba::2)  89.789 ms  91.291 ms  97.333 ms
 9  he-0-11-0-0-cr01.350ecermak.il.ibone.comcast.net (2001:558:0:f5b8::2)  87.518 ms  95.961 ms  87.506 ms                          
10  he-0-10-0-0-pe04.350ecermak.il.ibone.comcast.net (2001:558:0:f8cc::2)  87.406 ms  86.414 ms  87.425 ms                          
11  2001:550:2:2::32:2 (2001:550:2:2::32:2)  87.517 ms  86.589 ms  87.506 ms
-----

  Thoughts?

  	Thanks,

		Stephen
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