12,264
edits
TalkTalk and DSCP and 19 second latency: Difference between revisions
TalkTalk and DSCP and 19 second latency (view source)
Revision as of 20:55, 7 December 2021
, 7 December 2021→Show me
m (→Show me) |
m (→Show me) |
||
|
Here is 100 pings - though to keep the page short, I've included only every 10th ping, but you get the idea:
ping -i 0.02 -z 192 -s 1400 -c 100 81.187.81.18
PING 81.187.81.187 (81.187.81.187): 1400 data bytes
1408 bytes from 81.187.81.187: icmp_seq=0 ttl=63 time=10.234 ms
Whilst latency is shown to traffic tagged with DSCP CS6, all other traffic is unaffected, everything else has normal (good) latency.
Understanding the ping options:
* '''-i 0.02''' Setting the interval to 1 ping every 20 miliseconds. If the interval in increased (ie fewer pings per second) then the rate of traffic is low enough not to be caught by TalkTalk's traffic shaping policy
* '''-z 192''' Setting the DSCP bit to 192 (decimal)
* '''-s 1400''' Setting the packet size to 1400 bytes - quite large. If we reduce this, eg to 700 bytes then it takes longer for the latency to rise. Setting it to 600 and it seems the traffic is low enough not to be caught by TalkTalk's traffic shaping policy
* '''-c 100''' Just to 100 pings this time
=== pcaps ===
| |||