P

Saturday, June 7th, 2025 12:28 AM

Anycast Not Working Properly

Hello - Who do I need to escalate this with to get Anycast working correctly for our area?  The last few months it has been thinking Chicago is the closest area to us, but our connection is in Idaho/Utah.  It had been working fine and always selecting Denver as the closest, or areas in California were always the next closest.  Chicago shouldn't be getting the traffic at all.  I have waited for it to perhaps sort itself out, but it appears to be getting worse rather than better, as even google.com is now heading all the way to Chicago.  Here are a few examples to help:

google.com
(first hops deleted for privacy)
  6    11 ms    17 ms    13 ms  be-501-ar01.saltlakecity.ut.utah.comcast.net [24.124.175.214]
  7     *        *        *     Request timed out.
  8    20 ms     8 ms     9 ms  216.239.62.187
  9    11 ms    12 ms    13 ms  142.250.212.26
 10    24 ms   124 ms    16 ms  142.251.241.220
 11    40 ms    43 ms    31 ms  108.170.252.152
 12    34 ms     *       34 ms  209.85.249.128
 13    43 ms    41 ms    43 ms  192.178.255.11
 14    43 ms    44 ms    43 ms  209.85.249.137
 15    40 ms    41 ms    38 ms  192.178.249.209
 16    42 ms     *       45 ms  142.251.60.11
 17    42 ms    39 ms    39 ms  ord38s30-in-f14.1e100.net [142.250.191.174]

doh.xfinity.com
(first hops deleted for privacy)

 7    20 ms    17 ms    17 ms  be-501-ar01.saltlakecity.ut.utah.comcast.net [24.124.175.214]
  8    25 ms    33 ms    22 ms  be-36721-cs02.champa.co.ibone.comcast.net [96.110.43.229]
  9    54 ms    44 ms    52 ms  be-1224-cs22.northlake.il.ibone.comcast.net [96.110.35.53]
 10     *       47 ms    44 ms  96.110.41.54
 11    45 ms    54 ms     *     et-0-0-1-sas02-d.northlake.il.ndcchgo.comcast.net [69.139.239.122]
 12    51 ms    54 ms    62 ms  lo0-t1s8016-d.northlake.il.ndcchgo.comcast.net [96.109.108.90]
 13     *       44 ms    48 ms  lo0-t2s8006-d.northlake.il.ndcchgo.comcast.net [96.109.108.64]
 14    51 ms    43 ms    50 ms  lo0-t1s8009-d.northlake.il.ndcchgo.comcast.net [96.109.108.83]
 15     *        *        *     Request timed out.
 16    44 ms    43 ms    44 ms  10.60.164.131

dns.nextdns.io (Major DNS provider)
(first hops deleted for privacy)

 6    12 ms    13 ms    12 ms  be-501-ar01.saltlakecity.ut.utah.comcast.net [24.124.175.214]
  7    19 ms    22 ms    21 ms  be-36741-cs04.champa.co.ibone.comcast.net [96.110.43.237]
  8    46 ms    43 ms    54 ms  be-2311-pe11.350ecermak.il.ibone.comcast.net [96.110.33.202]
  9     *        *        *     Request timed out.
 10     *        *        *     Request timed out.
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
 13    43 ms    44 ms    43 ms  dns.nextdns.io [45.76.21.53]

dns.controld.com (Major DNS provider)
(first hops deleted for privacy)

 7     7 ms    12 ms    13 ms  be-501-ar01.saltlakecity.ut.utah.comcast.net [24.124.175.214]
  8    23 ms    30 ms    22 ms  be-36741-cs04.champa.co.ibone.comcast.net [96.110.43.237]
  9    18 ms    26 ms    21 ms  be-3412-pe12.910fifteenth.co.ibone.comcast.net [96.110.33.142]
 10    23 ms    26 ms    21 ms  ae-3.a00.dnvrco04.us.bb.gin.ntt.net [129.250.9.132]
 11     *        *        *     Request timed out.
 12    42 ms    46 ms    39 ms  ae-5.r25.chcgil09.us.bb.gin.ntt.net [129.250.3.160]
 13    55 ms    48 ms    43 ms  ae-13.a05.chcgil09.us.bb.gin.ntt.net [129.250.4.23]
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16     *        *        *     Request timed out.
 17     *        *        *     Request timed out.
 18    43 ms    41 ms    51 ms  dns.controld.com [76.76.2.22]

You can see traffic now just goes right through Denver/Colorado and straight to Chicago/Illinois.  I am using my own modem, and have forced it to grab a different IP and that didn't change anything.  I can't be the only one in the area having this issue.  Thanks for any help in getting this escalated to a network engineer who can sort it out.

Official Employee

 • 

146 Messages

1 day ago

Hello porkapatamus 👋 Thank you for using our community to reach out for support! We're not able to provide support for third-party products or services like Anycast on this platform, but I would recommend reaching out directly to Anycast support through their website, or potentially even the manufacturer of your modem if you're not able to brute force the connection from where you'd like it to be. 

 

Gold Problem Solver

 • 

26.4K Messages

11 hours ago

@XfinitySeth wrote: "... We're not able to provide support for third-party products or services like Anycast ... I would recommend reaching out directly to Anycast support ..."

'Anycast' as used by the OP (not to be confused with 'AnyCast' brand casting adapter devices) is not a brand name, company, or product, it's a networking technology Comcast uses in its DNS system. It is not a "third-party product". There is no "Anycast support" except that offered by Comcast's own networking staff.

Please see https://en.wikipedia.org/wiki/Anycast and/or https://www.cloudflare.com/learning/dns/what-is-anycast-dns/

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

(edited)

3 Messages

11 hours ago

Yes, what BruceW posted above.  I’m asking how I can get in contact with someone higher up in Internet support at Comcast who knows what I’m referring to, and can pass along my information to the appropriate network engineers to get it fixed.  This problem would have to be affecting every customer in this area, not just me.  Thanks!

Official Employee

 • 

1.7K Messages

 

Hey porkapatamus we can help with your connectivity concerns here and also check the area. We can return here and provide any update on what we find or assist with. Please send us a direct message with your full name and service address to get started. 
 
  • Make sure you are signed in here in the Xfinity Forum. Click "Sign In" if necessary
  • Click the "Direct Message" icon (square chat icon in the upper right corner of your screen next to the bell icon)
  • Click the "New message" (pencil and paper) icon
  • Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
  • Type your message in the text area near the bottom of the window
  • Press Enter to send it

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
forum icon

New to the Community?

Start Here