user_PH2h9j's profile

New Poster

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10 Messages

Thursday, July 24th, 2025

How can I get this information to the right folks in Tier 2/3 support?

Having issues that appear to be on Comcast's infrastructure and edge routers. I have had three tech visits. The issue isn't my house. Can someone help me get this to the right spot?

I am seeing consistent packet loss and latency issues impacting Zoom and real-time communications. These appear to originate on Comcast's internal routing infrastructure in the Atlanta/Marietta area. Specifically:

  • be-1402-ar-sp04.b0atlanta.ga.atlanta.comcast.net — high loss and jitter

  • be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net — intermittent spikes

  • po-600-xar01.b0atlanta.ga.atlanta.comcast.net — unstable RTT

  • be-33011-cs01.56marietta.ga.ibone.comcast.net — packet loss propagation

  • be-3111-pe11.56marietta.ga.ibone.comcast.net — loss and jitter at peering

These routers frequently show >50% packet loss and high jitter, confirmed via MTR and PingPlotter. Please escalate to your network operations team.

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Contributor

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158 Messages

1 month ago

Sadly they will dismiss tracert. I ended up taking a lot of screen shots and posting them and getting nowhere. So I finally filed a complaint with the FCC and got level three help. But i like everyone else is paying for high speeds and getting half of less download speeds.

New Poster

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10 Messages

@Aceq2jot​ Good idea on FCC complaint. I'll do that now.

Official Employee

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2.8K Messages

 

 

Hi there! Thanks again for breaking this down so clearly. Based on what you’re seeing with the packet loss and latency (especially impacting Zoom and real-time apps), there are a few things you can try from your side that sometimes help while network teams monitor the broader area:

  • If you haven’t already, try connecting directly to the modem with Ethernet to rule out any Wi-Fi issues, even if just temporarily for testing.

  • Restart the modem (a full power cycle, not just a quick reboot) to refresh the routing paths.

  • If you’re using a third-party router or any advanced configurations (like VPNs, Pi-hole, or custom DNS), try bypassing those temporarily and connecting directly to the gateway.

  • If possible, run a traceroute or PingPlotter test while directly connected and at a time when the issue is most noticeable — that way, you can better capture the path and impact. Keep those results saved.

Give those a try and let us know if you still see the issue. We will be happy tohelp further. 

 

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New Poster

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10 Messages

📡 PingPlotter Results: Ongoing Packet Loss 

Test Time: 7/24/2025 – 10:26–10:36 PM
Destination: zoom.us
IP: 2407:30c0:182::aa72:3402
Packet Size: ICMP over IPv6
Packet Loss: Present from mid-path through destination
Max Latency Spike: ~1800 ms
Focus Time: 10 minutes


🔎 Summary of Issue

I am experiencing packet loss and latency spikes during Zoom sessions and other real-time applications. This test shows packet loss beginning in the Comcast network, with the worst hop being:

  • Hop 6: be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net

    • Packet Loss: 84.5%

    • Avg Latency: 21.4 ms

This packet loss cascades downstream and continues all the way to the Zoom server.


📍 PingPlotter Hop Details

Hop Avg (ms) Min Max PL% Host/IP
1 4.3 2.4 5.7 0.0 2601:...8fe7
2 21.7 6.0 29.4 2.1 2001:558:...7080::3
3 21.1 6.0 29.1 2.1 po-114-rur602.b0atlanta.ga.atlanta.comcast.net
4 21.1 6.0 18.1 2.1 po-600-xar01.b0atlanta.ga.atlanta.comcast.net
5 21.4 11.1 * 84.5 be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net
6 29.1 9.8 56.9 56.9 be-1402-ar-sp04.b0atlanta.ga.atlanta.comcast.net
7 22.0 9.4 18.3 2.1 be-33041-cs04.56marietta.ga.ibone.comcast.net
8 20.7 8.4 18.6 2.1 be-3412-pe12.56marietta.ga.ibone.comcast.net
9 25.6 7.9 17.2 2.1 2001:559:0:1c::e
10 30.7 7.6 21.8 2.5 zoom.us

🧩 Visual Evidence

  • Latency spikes and packet loss shown in red at the bottom graph.

  • Consistent pattern of failure on Comcast-owned infrastructure.

  • Problem occurs independent of local activity — already tested via VPN and alternate networks.


✅ Requested Action

Please escalate this to network engineering or your regional NOC, as the issue is clearly beyond the home and affecting Comcast backbone routing.

Let me know if you'd like this exported as a PDF or to include multiple test periods.

New Poster

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10 Messages

Absolutely — here's a clear summary of your past traceroutes that highlight the recurring issue. You can copy-paste this into a support ticket, chat, or email to Comcast, or share it with the technician visiting your home.


📊 Summary: Traceroute Results Indicating Comcast Routing Issues

⚠️ Problem:

Traceroute tests from my Mac to Google DNS (8.8.8.8) and Zoom servers consistently show packet loss and latency spikes starting at Comcast edge or aggregation routers, before leaving the Comcast network.


🧵 Common Pattern Across Traceroutes:

  • Hop 3–5 often involves routers like:

    • po-114-rur601.b0atlanta.ga.atlanta.comcast.net

    • po-600-xar01.b0atlanta.ga.atlanta.comcast.net

    • be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net

  • Latency and packet loss spikes begin at these nodes and continue downstream, suggesting upstream congestion or instability.


🔁 Selected Examples

▶️ Traceroute to Google (8.8.8.8)

3  po-114-rur601.b0atlanta.ga.atlanta.comcast.net  17.529 ms
4  po-600-xar01.b0atlanta.ga.atlanta.comcast.net   9.671 ms
5  be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net 7.271 ms
6  be-1402-ar-sp04.b0atlanta.ga.atlanta.comcast.net 12.094 ms
...
11 dns.google (8.8.8.8)                             14.329 ms

Issue: Multiple Comcast edge routers showing latency spread and jitter in the 10–20ms range — with periodic loss.


▶️ Traceroute to Zoom (us02www3.zoom.us)

5  be-312-ar-in02.b0atlanta.ga.atlanta.comcast.net 15.152 ms
6  be-1402-ar-sp04.b0atlanta.ga.atlanta.comcast.net 14.9 ms
7  be-33021-cs02.56marietta.ga.ibone.comcast.net   21.328 ms
...
12 us02www3.zoom.us                                26.0 ms

Issue: Repeated high average latency on hops 5–7, all within the Comcast Atlanta metro backbone, especially the ar-in02 and ar-sp04 nodes.


🔎 Additional Observations:

  • Even with VPN enabled (ProtonVPN), tests rerouted traffic around Comcast and showed lower packet loss, confirming Comcast path instability.

  • PingPlotter tests corroborate these results with visual latency spikes and packet drops.


📌 What to Tell Comcast:

Please escalate these findings. I have independent, timestamped traceroutes and MTRs showing persistent issues on Comcast infrastructure — specifically edge and core routers in the Atlanta area.

These are not Wi-Fi issues, not related to inside wiring, and affect multiple services (Zoom, Google DNS, etc.). A field technician alone likely can’t resolve this without upstream NOC support.

Let me know if you'd like this exported or formatted differently (e.g., CSV, PDF).

Official Employee

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1.4K Messages

Thank you so much for sharing all the details with us, and we would be happy to dive further into your account with you @user_PH2h9j! Can you please send us a DM to get started?

 

Please send us a DM with your full name and address to Xfinity Support.

To send a direct message:

Click "Sign In" if necessary

Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging

Click the "New message" (pen and paper) icon

The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.

As you are typing a drop-down list appears. Select "Xfinity Support" from that list.

A "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

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