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.
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.
=TL;DR=
ping -i 0.02 -z 192 -s 1400 -c 100 81.187.81.18
PING
1408 bytes from
Request timeout for icmp_seq 10
1408 bytes from
1408 bytes from
1408 bytes from
1408 bytes from
Request timeout for icmp_seq 70
1408 bytes from
Request timeout for icmp_seq 80
1408 bytes from
1408 bytes from
1408 bytes from
1408 bytes from
1408 bytes from
1408 bytes from
100 packets transmitted, 100 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 9.734/929.728/2047.155/628.466 ms
This only goes up to just under 2 seconds, but if left, it will peak and continue to run at 19 seconds:
1408 bytes from
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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