[outages] Spectrum/Charter IPv6 connectivity to CloudFlare down in Texas

[Carl Perry]

Things have been rather slow the last couple of days, just figured out 
why; No IPv6 connectivity to any CloudFlare services.

 > mtr -6 --report-wide cloudflare.com
Start: 2023-04-19T23:20:42+0000
HOST: defiant Loss%   Snt   Last   Avg  Best  Wrst StDev
   1.|-- 2603-8081-2340-2868-0215-17ff-fe94-6457.res6.spectrum.com 
0.0%    10    3.6  19.1   1.5  93.2  36.1
   2.|-- 2603-90c5-0003-0180-0000-0000-0000-0001.inf6.spectrum.com 
0.0%    10   14.5  36.6  11.3 171.2  50.0
   3.|-- lag-63.hcr02rdrktxaz.netops.charter.com 0.0%    10   18.8  
37.3  12.0 143.9  45.3
   4.|-- lag-19.ausxtxir02r.netops.charter.com 60.0%    10   65.8  30.2  
11.7  65.8  24.9
   5.|-- lag-22.rcr01hstqtx02.netops.charter.com 80.0%    10   26.5  
25.5  24.5  26.5   1.4
   6.|-- lag-16.hstqtx0209w-bcr00.netops.charter.com 90.0%    10   25.7  
25.7  25.7  25.7   0.0
   7.|-- lag-12.dllstx976iw-bcr00.netops.charter.com 40.0%    10   25.4  
26.3  18.2  44.4   9.5
   8.|-- ??? 100.0    10    0.0   0.0   0.0   0.0   0.0

IPv4 works however:

 > mtr -4 --report-wide cloudflare.com
Start: 2023-04-19T23:20:21+0000
HOST: defiant                                     Loss%   Snt Last   
Avg  Best  Wrst StDev
   1.|-- _gateway                                     0.0%    10 2.1   
1.8   1.4   2.1   0.2
   2.|-- cpe-70-114-160-1.austin.res.rr.com           0.0%    10 51.9  
34.4  14.3 149.7  42.1
   3.|-- lag-63.hcr01rdrktxaz.netops.charter.com      0.0%    10 13.1  
38.5  13.1 159.1  44.6
   4.|-- lag-19.ausutxla01r.netops.charter.com        0.0%    10 18.1  
21.0  14.3  34.8   6.0
   5.|-- lag-22.rcr01dllatx37.netops.charter.com      0.0%    10 23.4  
23.3  18.3  33.3   4.3
   6.|-- lag-14.dllstx976iw-bcr00.netops.charter.com  0.0%    10 19.8  
27.0  16.1  51.2  11.9
   7.|-- lag-0.pr3.dfw10.netops.charter.com           0.0%    10 39.3  
28.5  14.1  62.3  16.7
   8.|-- 141.101.74.104                              40.0%    10 53.2  
44.3  19.4 120.2  39.2
   9.|-- 172.71.168.2                                 0.0%    10 28.3  
28.8  10.8  79.4  19.5
  10.|-- 104.16.133.229                               0.0%    10 122.0  
42.8  16.9 122.0  34.4

It's kind of wild how many things don't fall back to IPv4 quickly (lots 
of Android TV apps) or at all (.NET). I tried reaching out to Spectrum 
support, but being a lowly consumer I was only told that "The modem 
doesn't have any filters" and that "the problem may be on the CloudFlare 
side", which was sadly what I predicted. So, I figured I would raise the 
issue here in the hopes that actual network people would see it.

   -Carl