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Persistent 80%+ packet loss / connection timeouts on Lumen (AS3356) transit — Philadelphia area
Hi,
I'm experiencing persistent, reproducible packet loss on the Comcast → Lumen (AS3356) transit path out of Philadelphia, PA, affecting all traffic to destinations in Kyrgyzstan (and likely other destinations routed via this path). This has been happening consistently, not just during peak hours.
Location: Wilmington, DE
Issue: Sites/servers in Kyrgyzstan (e.g. smartex.kg, 91.207.28.50) are unreachable or extremely degraded. This is not limited to one destination — it affects the whole region behind this route.
Diagnostics:
- MTR showing sustained loss starting right at the Comcast→Lumen handoff and persisting through to the destination:
mtr -rwzbc 200 smartex.kg
HOST: z890mriptide Loss% Snt Avg
1. _gateway (10.0.0.1) 2.5% 200 1.1
2. 100.93.232.131 0.0% 200 10.5
3. 68.86.216.225 (AS7922) 0.0% 200 10.7
4. po-200-xar02.newcastle.de.panjde.comcast.net (AS7922) 0.0% 200 11.2
5. be-23-rar01.coatesville.pa.panjde.comcast.net (AS7922) 0.0% 200 13.3
6. be-201-ar03.ivyland.pa.panjde.comcast.net (AS7922) 0.0% 200 17.2
7. ae13.bar4.phi1.sp.lumen.tech (4.68.38.221) (AS3356) 50.5% 200 18.7
8. ae2.3204.edge7.ams1.neo.colt.net (AS3356) 1.0% 200 96.9
9. UCOM-LLC.edge7.Amsterdam1.Level3.net (213.19.194.214) (AS3356) 83.0% 200 397.5
10. *** (100% loss)
11. ts2-a77.Voronezh.dial.rol.ru (AS3216) 82.5% 200 430.2
12. 89.38.164.52 (AS35168) 93.0% 200 459.6
13. 89.38.164.53 (AS35168) 80.5% 200 463.7
14. 217-29-18-185.saimanet.kg (AS29061) 79.0% 200 474.9
15. smartex.kg (91.207.28.50) (AS39819) 80.0% 200 469.3mtr -rwzbc 100 o.kg
Start: 2026-07-08T21:34:28-0400
HOST: z890mriptide Loss% Snt Last Avg Best Wrst StDev
1. AS??? _gateway (10.0.0.1) 0.0% 100 0.8 1.1 0.4 2.4 0.3
2. AS??? 100.93.232.130 0.0% 100 11.3 10.7 4.9 14.4 1.8
3. AS7922 po-305-327-rur201.newcastle.de.panjde.comcast.net (68.86.216.109) 0.0% 100 9.3 10.7 7.7 14.9 1.4
4. AS7922 68.86.211.142 0.0% 100 12.2 10.8 4.4 15.4 1.6
5. AS7922 po-200-xar02.newcastle.de.panjde.comcast.net (96.110.126.205) 0.0% 100 9.9 11.1 5.2 14.0 1.6
6. AS7922 be-23-rar01.coatesville.pa.panjde.comcast.net (68.86.208.5) 0.0% 100 17.3 13.2 10.8 17.3 1.3
7. AS7922 be-201-ar03.ivyland.pa.panjde.comcast.net (96.108.181.21) 0.0% 100 16.9 15.5 12.2 19.6 1.6
8. AS3356 ae13.bar4.phi1.sp.lumen.tech (4.68.38.221) 75.0% 100 22.2 17.6 10.8 24.7 3.1
9. AS3356 ae2.3204.edge7.ams1.neo.colt.net (171.75.9.210) 3.0% 100 94.8 111.5 90.1 1618. 154.7
10. AS3356 UCOM-LLC.edge7.Amsterdam1.Level3.net (213.19.194.214) 70.0% 100 536.0 529.7 513.4 536.3 6.5
11. AS??? ??? 100.0 100 0.0 0.0 0.0 0.0 0.0
12. AS3216 ts2-a77.Voronezh.dial.rol.ru (194.186.136.77) 73.0% 100 561.5 559.1 527.7 569.8 7.8
13. AS35168 89.38.164.52 85.0% 100 574.9 575.6 563.4 582.7 5.8
14. AS35168 89.38.164.53 75.0% 100 580.5 582.5 569.8 612.5 8.4
15. AS8449 nurtelecom-inet-local-2.elcat.kg (94.143.195.130) 69.0% 100 591.9 590.0 578.8 610.9 5.6
16. AS8449 nurtelecom-inet-remote-2.elcat.kg (94.143.195.131) 76.0% 100 582.4 583.3 571.8 589.7 5.0
17. AS47237 bish-bb1.o.kg (194.152.36.93) 74.0% 100 576.9 583.6 572.0 590.7 4.9
18. AS??? ??? 100.0 100 0.0 0.0 0.0 0.0 0.0
mtr -rwzbc 100 elcat.kg
Start: 2026-07-08T21:38:12-0400
HOST: z890mriptide Loss% Snt Last Avg Best Wrst StDev
1. AS??? _gateway (10.0.0.1) 0.0% 100 0.6 1.1 0.3 2.7 0.4
2. AS??? 100.93.232.130 0.0% 100 9.7 11.4 7.7 22.4 1.8
3. AS7922 po-305-327-rur201.newcastle.de.panjde.comcast.net (68.86.216.109) 0.0% 100 10.4 10.8 7.1 21.4 1.9
4. AS7922 68.86.211.142 0.0% 100 12.7 11.2 4.4 22.4 2.3
5. AS7922 po-200-xar02.newcastle.de.panjde.comcast.net (96.110.126.205) 0.0% 100 13.2 11.5 7.9 18.1 1.6
6. AS7922 be-23-rar01.coatesville.pa.panjde.comcast.net (68.86.208.5) 0.0% 100 14.9 13.6 7.1 16.8 1.7
7. AS7922 be-201-ar03.ivyland.pa.panjde.comcast.net (96.108.181.21) 0.0% 100 16.0 17.0 11.1 87.1 7.8
8. AS3356 ae13.bar4.phi1.sp.lumen.tech (4.68.38.221) 11.0% 100 15.6 17.5 10.9 32.9 3.3
9. AS3356 ae2.3204.edge7.ams1.neo.colt.net (171.75.9.210) 1.0% 100 95.6 96.9 87.7 133.7 7.5
10. AS3356 UCOM-LLC.edge7.Amsterdam1.Level3.net (213.19.194.214) 76.0% 100 525.3 417.7 121.9 596.6 193.0
11. AS??? ??? 100.0 100 0.0 0.0 0.0 0.0 0.0
12. AS3216 195.16.47.147 85.0% 100 596.7 448.9 161.5 608.8 208.2
13. AS35168 89.38.165.232 99.0% 100 181.9 181.9 181.9 181.9 0.0
14. AS35168 89.38.165.233 80.0% 100 627.4 467.3 183.9 642.3 206.7
15. AS8449 m2x2.elcat.kg (94.143.195.7) 75.0% 100 646.6 518.8 208.3 655.8 195.0
16. AS8449 web2-gtw.elcat.kg (212.42.102.193) 73.0% 100 622.2 505.3 178.7 649.7 192.1
17. AS8449 zima-new.elcat.kg (212.42.102.197) 71.0% 100 622.0 513.2 181.4 661.2 186.2
Loss begins precisely at the Comcast-to-Lumen handoff (hop 7, ae13.bar4.phi1.sp.lumen.tech) and worsens dramatically at UCOM-LLC.edge7.Amsterdam1.Level3.net (hop 9, 83% loss), then persists at 80-93% through every subsequent hop all the way to the destination. This is not ICMP deprioritization on an intermediate router — the loss is carried through to the final destination and confirmed with real TCP traffic below.
- Confirmed with a real TCP connection attempt, not just ICMP:
curl -v --max-time 15 https://smartex.kg
* Trying 91.207.28.50:443...
* Connection timed out after 15000 milliseconds
curl: (28) Connection timed out after 15000 millisecondsSummary: This looks like a chronic congestion/degradation issue on the Lumen (AS3356) transit segment in Amsterdam that Comcast routes through for this destination range. Could someone from the Digital Care team take a look and/or escalate to Lumen? Happy to provide additional traceroutes at different times of day if useful.
Thanks in advance.
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