Cogent NOC

Randy amps at djlab.com
Wed Dec 14 20:15:52 UTC 2016


Walking the line, so to speak. Starting with our directly connected 
cogent peer.  Loss begins at the same hop and carries through to the end 
host.   I'm only using cogentco as an example, but the results are the 
same anywhere.

[root at mon ~]# ping -c 1000 -f 38.88.249.209
PING 38.88.249.209 (38.88.249.209) 56(84) bytes of data.

--- 38.88.249.209 ping statistics ---
1000 packets transmitted, 1000 received, 0% packet loss, time 765ms
rtt min/avg/max/mdev = 0.422/0.703/3.064/0.273 ms, ipg/ewma 0.765/0.648 
ms
[root at mon ~]# ping -c 1000 -f 154.24.36.5
PING 154.24.36.5 (154.24.36.5) 56(84) bytes of data.

--- 154.24.36.5 ping statistics ---
1000 packets transmitted, 1000 received, 0% packet loss, time 754ms
rtt min/avg/max/mdev = 0.523/0.699/2.958/0.190 ms, ipg/ewma 0.755/0.663 
ms
[root at mon ~]# ping -c 1000 -f 154.24.36.21
PING 154.24.36.21 (154.24.36.21) 56(84) bytes of data.
.....
--- 154.24.36.21 ping statistics ---
1000 packets transmitted, 995 received, 0% packet loss, time 1473ms
rtt min/avg/max/mdev = 0.718/1.330/3.471/0.461 ms, ipg/ewma 1.475/1.611 
ms
[root at mon ~]# ping -c 1000 -f 154.54.42.105
PING 154.54.42.105 (154.54.42.105) 56(84) bytes of data.
........
--- 154.54.42.105 ping statistics ---
1000 packets transmitted, 992 received, 0% packet loss, time 1996ms
rtt min/avg/max/mdev = 0.884/1.794/6.813/0.626 ms, ipg/ewma 1.998/1.983 
ms
[root at mon ~]# ping -c 1000 -f 154.54.7.54
PING 154.54.7.54 (154.54.7.54) 56(84) bytes of data.
.....
--- 154.54.7.54 ping statistics ---
1000 packets transmitted, 995 received, 0% packet loss, time 2376ms
rtt min/avg/max/mdev = 1.202/2.227/5.847/0.901 ms, ipg/ewma 2.378/1.465 
ms
[root at mon ~]# ping -c 1000 -f 154.54.0.82
PING 154.54.0.82 (154.54.0.82) 56(84) bytes of data.
.........
--- 154.54.0.82 ping statistics ---
1000 packets transmitted, 991 received, 0% packet loss, time 2766ms
rtt min/avg/max/mdev = 1.178/2.530/6.219/0.831 ms, ipg/ewma 2.769/2.583 
ms
[root at mon ~]# ping -c 1000 -f 38.100.128.10
PING 38.100.128.10 (38.100.128.10) 56(84) bytes of data.
.....
--- 38.100.128.10 ping statistics ---
1000 packets transmitted, 995 received, 0% packet loss, time 1730ms
rtt min/avg/max/mdev = 0.835/1.548/19.553/0.717 ms, ipg/ewma 1.732/1.077 
ms

>> After three days of no email response for my ticket, I called and 
>> after an hour of my life I want back, front line support cannot 
>> reproduce the loss.   Final conclusion: "Your host is dropping 
>> packets".
>> 
>> --
>> ~Randy


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