TalkTalk and DSCP and 19 second latency: Difference between revisions
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This page is about in interesting problem that was reported to us, by a customer, in December 2021. We have written this up so that this page can be found if other people are seeing a similar problem. |
This page is about in interesting problem that was reported to us, by a customer, in December 2021. We have written this up so that this page can be found if other people are seeing a similar problem. |
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We've masked the IP we're pinging in this page as it doesn't matter what IP you ping - in our tests though we were mostly pinging the IP of our LNS, as that is the 'next hop' on the customer's route to the internet. |
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=TL;DR= |
=TL;DR= |
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ping -i 0.02 -z 192 -s 1400 -c 100 81.187.81.18 |
ping -i 0.02 -z 192 -s 1400 -c 100 81.187.81.18 |
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PING |
PING x.x.x.x (x.x.x.x): 1400 data bytes |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=0 ttl=63 time=10.234 ms |
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Request timeout for icmp_seq 10 |
Request timeout for icmp_seq 10 |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=10 ttl=63 time=37.160 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=11 ttl=63 time=16.935 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=20 ttl=63 time=278.065 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=30 ttl=63 time=386.798 ms |
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Request timeout for icmp_seq 70 |
Request timeout for icmp_seq 70 |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=40 ttl=63 time=793.062 ms |
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Request timeout for icmp_seq 80 |
Request timeout for icmp_seq 80 |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=50 ttl=63 time=836.497 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=60 ttl=63 time=1040.796 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=70 ttl=63 time=1453.866 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=80 ttl=63 time=1461.298 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=90 ttl=63 time=1935.554 ms |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=99 ttl=63 time=1978.546 ms |
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100 packets transmitted, 100 packets received, 0.0% packet loss |
100 packets transmitted, 100 packets received, 0.0% packet loss |
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round-trip min/avg/max/stddev = 9.734/929.728/2047.155/628.466 ms |
round-trip min/avg/max/stddev = 9.734/929.728/2047.155/628.466 ms |
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This only goes up to just under 2 seconds, but if left, it will peak and continue to run at 19 seconds: |
This only goes up to just under 2 seconds, but if left, it will peak and continue to run at 19 seconds: |
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1408 bytes from |
1408 bytes from x.x.x.x: icmp_seq=986 ttl=63 time=19084.589 ms |
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Whilst latency is shown to traffic tagged with DSCP CS6, all other traffic is unaffected, everything else has normal (good) latency. |
Whilst latency is shown to traffic tagged with DSCP CS6, all other traffic is unaffected, everything else has normal (good) latency. |
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