Visitor
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1 Message
Packet loss every 11 minutes 30 seconds, gateway clean, unresolved since July
My internet drops packets every 11 and a half minutes. This has been going on since July. Three reports so far and nothing has been fixed.
What happens: every 11 min 30 sec, latency goes from 32ms to over 2500ms and packets drop for 5-10 seconds. It repeats about 5 seconds later, then recovers. Like clockwork.
I logged it for 50 minutes on 9/8/26, pinging three targets once per second at the same time:
My gateway (10.0.0.1) 3001 pings, 0 lost
Cloudflare (1.1.1.1) 3009 pings, 15 lost, worst 2589ms
Game server (8.42.17.142) 2977 pings, 44 lost, worst 2632ms
My gateway never dropped a single packet out of 3001. Both outside targets went bad at the same timestamps. So the problem starts past my gateway.
Drop times, 9/8/26 EDT:
19:43:28
19:54:59
20:06:29
20:17:59
That is 11m31s, 11m30s, 11m30s apart. Congestion does not run on a schedule. Something on your side is on a timer. Please check your CMTS logs against those times.
Already ruled out, so please don't ask me to redo them:
- Not my PC. On 8/22 I ran the same test on a separate Raspberry Pi at the same time. Both machines dropped in the same seconds while the gateway answered fine on both.
- Not wifi. Wired ethernet, 1 Gbps link (have tried multiple cables)
- Not my router. The gateway is clean through every event.
- Not one website. Cloudflare and an unrelated game server fail together.
- Not the wall coax. I tightened it on 7/9 and nothing changed, so the fault is past that connector.
On 7/9 I caught hop 2 (10.112.159.194) at 429ms and 410ms during two events. On 8/22 hop 3 (68.86.145.57) dropped 2 of 3 probes mid-burst. Hop 1 was under 1ms every time.
What I need:
1. Upstream SNR and MER per channel
2. Uncorrectable codeword counts, not just corrected
3. T3 and T4 timeout counts
4. A line tech to check the drop cable, outside splitters, and the tap
5. Check whether anything on my node runs on an 11m30s cycle I have continuous logs and can run a capture during a call. The drops come every 11 and a half minutes, so you can watch one
happen live.
XfinityJeffB
Official Employee
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708 Messages
13 days ago
Hello Gmac114, thank you for the detailed information. So we can proceed and get your account info( we don't want that shared here), we need to move to DM.
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