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Cloudflare 1.1.1.1 DNS Unreachable From Nashville

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Cloudflare 1.1.1.1 DNS Unreachable From Nashville

Cloudflare's new 1.1.1.1 DNS resolver is unreachable on Comcast's network from Nashville. They appear to be null routing 1.1.1.1/32.

 

$ traceroute 1.1.1.1

traceroute to 1.1.1.1 (1.1.1.1), 64 hops max, 52 byte packets

 1  gateway (10.0.1.1)  0.703 ms  0.472 ms  0.386 ms

 2  96.120.52.49 (96.120.52.49)  7.547 ms  7.926 ms  9.967 ms

 3  68.85.50.157 (68.85.50.157)  9.314 ms  9.863 ms  11.422 ms

 4  * ae-30-ar02.nashville.tn.nash.comcast.net (162.151.94.201)  17.153 ms !N  15.665 ms !N

 

But 1.0.0.1 functions as intended

 

$ traceroute 1.0.0.1

traceroute to 1.0.0.1 (1.0.0.1), 64 hops max, 52 byte packets

 1  gateway (10.0.1.1)  0.642 ms  0.491 ms  0.398 ms

 2  96.120.52.49 (96.120.52.49)  12.137 ms  7.482 ms  7.637 ms

 3  68.85.50.157 (68.85.50.157)  9.629 ms  9.830 ms  10.684 ms

 4  ae-30-ar02.nashville.tn.nash.comcast.net (162.151.94.201)  8.608 ms  8.375 ms  9.209 ms

 5  96.114.68.78 (96.114.68.78)  9.115 ms  17.270 ms  9.200 ms

 6  1dot1dot1dot1.cloudflare-dns.com (1.0.0.1)  8.792 ms  10.618 ms  9.276 ms

 

Anyone from Comcast out there who can get this fixed? The network is announced in Comcast's network so it appears to be a route in 162.151.94.201 that's dropping the traffic.

 

route-server.newyork.ny.ibone>show ip bgp 1.1.1.1

BGP routing table entry for 1.1.1.0/24, version 372428066

Paths: (7 available, best #6, table Default-IP-Routing-Table)

  Not advertised to any peer

  13335 13335 13335, (aggregated by 13335 172.68.188.1)

    68.86.1.78 (metric 82691) from 68.86.80.25 (68.86.1.25)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:78 7922:888 7922:2900

      Originator: 68.86.1.78, Cluster list: 68.86.1.25

  13335 13335 13335, (aggregated by 13335 141.101.74.1)

    68.86.1.41 (metric 73806) from 68.86.80.24 (68.86.1.24)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:41 7922:888 7922:2900

      Originator: 68.86.1.41, Cluster list: 68.86.1.24

  13335 13335 13335, (aggregated by 13335 172.68.32.1)

    68.86.1.76 (metric 74381) from 68.86.80.17 (68.86.1.17)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:76 7922:888 7922:2900

      Originator: 68.86.1.76, Cluster list: 68.86.1.17

  13335 13335 13335, (aggregated by 13335 108.162.235.1)

    68.86.1.40 (metric 69741) from 68.86.80.14 (68.86.1.14)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:40 7922:888 7922:2900

      Originator: 68.86.1.40, Cluster list: 68.86.1.14

  13335 13335 13335, (aggregated by 13335 141.101.73.1)

    68.86.1.63 (metric 69676) from 68.86.80.5 (68.86.1.5)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:63 7922:888 7922:2900

      Originator: 68.86.1.63, Cluster list: 68.86.1.5

  13335 13335 13335, (aggregated by 13335 199.27.132.1)

    68.86.1.49 (metric 65686) from 68.86.80.3 (68.86.1.3)

      Origin IGP, metric 0, localpref 300, valid, internal, best

      Community: 7922:49 7922:888 7922:2900

      Originator: 68.86.1.49, Cluster list: 68.86.1.3, 68.86.1.2

  13335 13335 13335, (aggregated by 13335 173.245.63.1)

    68.86.1.42 (metric 66836) from 68.86.80.1 (68.86.1.1)

      Origin IGP, metric 0, localpref 300, valid, internal

      Community: 7922:42 7922:888 7922:2900

      Originator: 68.86.1.42, Cluster list: 68.86.1.1

Official Employee

Re: Cloudflare 1.1.1.1 DNS Unreachable From Nashville

I read elsewhere that this is working now. I tried it from a couple of locations in the Nashville area and it worked. Can you confirm that it works for you now?


I am an Official Comcast Employee.
Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
New Poster

Re: Cloudflare 1.1.1.1 DNS Unreachable From Nashville

Yep it's working now. Thanks for the heads up and quick fix!

Official Employee

Re: Cloudflare 1.1.1.1 DNS Unreachable From Nashville

Thanks for the confirmation! I'm glad to hear it's definitely working now.


I am an Official Comcast Employee.
Official Employees are from multiple teams within Comcast: CARE, Product, Leadership. We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Regular Visitor

Re: Cloudflare 1.1.1.1 DNS Unreachable From Nashville

Hi John.
Please, my issue isn't related to the topic above. You were mentioned on another thread regarding a problem I am facing.
I've been unable to connect to Ipv4 related websites (I am only able to assess ipv6 websites like Google, YouTube, and Facebook). I use an Arris Sbg6700-ac modem. This stared after I have the wrong Mac ID during activation process. This was rectified a week later after a technician came by. But I can't assess other sites Asides Google, YouTube and Facebook. I have called customer support staffs numerous times with no solution offered. I would be very grateful if you could help. Thank you.