Visitor
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3 Messages
Chicago area significant packet loss
Hi there, I've been seeing significant packet loss (40-50%) on one of Xfinity's routers (be-310-arsc1.area4.il.chicago.comcast.net) and wanted to let you all know. It was showing this level of loss last night as well, and I only just started checking:
Output from running mtr 8.8.8.8
-> 8.8.8.8 (8.8.8.8) 2025-06-12T11:35:49-0500
Keys: Help Display mode Restart statistics Order of fields quit
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
1. _gateway 0.0% 62 1.0 5.2 0.9 68.6 12.3
2. 10.61.156.195 0.0% 62 8.6 16.1 8.0 78.5 15.0
3. (waiting for reply)
4. et-1-rer01.northwest.in.indiana.comcast.net 0.0% 62 10.2 18.4 8.6 104.4 19.5
5. po-2-rur202.mtprospect.il.chicago.comcast.net 0.0% 62 11.1 16.9 8.3 87.3 17.7
6. po-200-xar02.mtprospect.il.chicago.comcast.net 0.0% 62 9.4 15.0 8.1 76.6 14.4
7. be-310-arsc1.area4.il.chicago.comcast.net 44.3% 62 12.1 33.8 10.7 233.8 58.1
8. be-502-ar01.area4.il.chicago.comcast.net 1.6% 62 157.9 96.6 10.9 991.5 208.4
9. c-50-171-101-226.unallocated.comcastbusiness.net 0.0% 62 15.2 19.5 11.8 89.8 15.6
10. 142.250.208.245 0.0% 62 13.7 18.2 11.3 97.5 15.7
11. 142.251.60.21 0.0% 61 10.3 18.6 10.3 81.5 15.9
12. dns.google 0.0% 61 18.4 25.4 10.2 113.8 22.4
srish
Visitor
•
3 Messages
2 days ago
Interestingly, the packet loss directly to that server be-502-ar01.area4.il.chicago.comcast.net is
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
6. po-200-xar02.mtprospect.il.chicago.comcast.net 0.0% 96 21.6 17.8 8.5 118.0 17.1
7. be-310-arsc1.area4.il.chicago.comcast.net 0.0% 96 23.5 18.0 10.5 98.3 12.3
but trying to hit something upstream from there is nearly 90% packet loss:
Packets Pings
Host Loss% Snt Last Avg Best Wrst StDev
6. po-200-xar02.mtprospect.il.chicago.comcast.net 0.0% 107 11.8 13.9 8.2 50.3 9.8
7. be-310-arsc1.area4.il.chicago.comcast.net 86.8% 106 12.7 30.4 12.7 222.9 55.5
8. be-502-ar01.area4.il.chicago.comcast.net 0.0% 106 16.0 48.3 11.3 916.7 115.0
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