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problems with comcast & cloudflare w/ ipv6

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Anyone else having trouble with cloudfare hosted services over IPV6?

ipv4 works.  ipv6 fails.

I've tried w/ RCN, and it works okay, so the problem seems to be specific to comcast & cloudflare.  it includes all cloudfare hosted content and sites, and their OCSP service w/ globalsign

examples below are a traceroute and HTTP GET over ipv6 and ipv4

 

 

traceroute6 www.cloudflare.com
traceroute to www.cloudflare.com.cdn.cloudflare.net (2400:cb00:2048:1::c629:d7a3) , 30 hops max, 24 byte packets
 1  2001:558:4023:ef::1 (2001:558:4023:ef::1)  15.534 ms  8.366 ms  7.963 ms
 2  te-0-1-0-1-sur01.roxbury.ma.boston.comcast.net (2001:558:202:f007::1)  8.404 ms  8.879 ms  13.927 ms
 3  be-98-ar01.needham.ma.boston.comcast.net (2001:558:200:1e0::1)  21.117 ms  10.1 ms  11.965 ms
 4  he-2-7-0-0-cr01.newyork.ny.ibone.comcast.net (2001:558:0:f7c7::1)  17.296 ms  17.252 ms  15.899 ms
 5  pos-0-2-0-0-pe01.111eighthave.ny.ibone.comcast.net (2001:558:0:f5f8::2)  15.205 ms  15.842 ms  15.984 ms
 6  as4436-2-c.111eighthave.ny.ibone.comcast.net (2001:559::51a)  16.979 ms  18.877 ms  15.966 ms
 7  * * *
 8  * * *
 9  * * *
10  * * *
11  * * *
12  * * *

 

 

traceroute www.cloudflare.com
traceroute to www.cloudflare.com (198.41.215.163), 30 hops max, 60 byte packets
 1  * * *
 2  te-0-1-0-1-sur01.roxbury.ma.boston.comcast.net (68.85.142.169)  9.755 ms  10.676 ms  12.429 ms
 3  be-98-ar01.needham.ma.boston.comcast.net (68.85.106.13)  15.972 ms  16.906 ms  16.976 ms
 4  he-2-6-0-0-cr01.newyork.ny.ibone.comcast.net (68.86.93.33)  43.280 ms  43.171 ms  43.181 ms
 5  he-0-11-0-0-pe02.111eighthave.ny.ibone.comcast.net (68.86.85.18)  41.857 ms  40.952 ms  41.839 ms
 6  as4436-1-c.111eighthave.ny.ibone.comcast.net (173.167.57.162)  45.825 ms  39.194 ms  39.193 ms
 7  vlan-75.ar2.ewr1.us.as4436.gtt.net (69.31.34.129)  38.347 ms  37.850 ms  41.128 ms
 8  as13335.xe-4-0-3.ar2.ewr1.us.as4436.gtt.net (69.31.34.118)  40.013 ms 204.93.33.198 (204.93.33.198)  40.347 ms 204.93.33.194 (204.93.33.194)  39.899 ms
 9  198.41.215.163 (198.41.215.163)  39.645 ms  37.346 ms  38.578 ms

 

 

 

 

 wget http://www.cloudflare.com
--2014-10-11 16:31:48--  http://www.cloudflare.com/
Resolving www.cloudflare.com (www.cloudflare.com)... 2400:cb00:2048:1::c629:d6a3, 2400:cb00:2048:1::c629:d7a3, 198.41.215.163, ...
Connecting to www.cloudflare.com (www.cloudflare.com)|2400:cb00:2048:1::c629:d6a3|:80... failed: Connection timed out.

 

 

 

wget -4 http://www.cloudflare.com
--2014-10-11 16:34:13--  http://www.cloudflare.com/
Resolving www.cloudflare.com (www.cloudflare.com)... 198.41.215.163, 198.41.214.163
Connecting to www.cloudflare.com (www.cloudflare.com)|198.41.215.163|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘index.html’

    [ <=>                                                                               ] 11,097      --.-K/s   in 0s

2014-10-11 16:34:13 (22.0 MB/s) - ‘index.html’ saved [11097]

 


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