Monitors mishandling empty responses

[davehart]

@ask please take a look at this discussion:

Uk.pool.ntp.org delivering wrong time

Ouch! Miroslav and PoolMUC have identified a stinker of a bug in the monitoring. As you can see from the .csv PoolMUC points to: ts_epoch,ts,offset,step,score,monitor_id,monitor_name,leap,error 1723614741,2024-08-14 05:52:21,,1,19.00510025,24,recentmedian,, 1723614741,2024-08-14 05:52:21,0,1,18.477138519,56,plszy1-361g4fk,, The observed offset should be appearing between 05:52:21 and 1. There is no offset provided by the server with a zero-payload response, but the monitors are treating tha…

It appears when a NTP server responds with no UDP payload it’s treated as a perfect 0 offset and included in the pool.

[ask]

Thanks. That’s indeed surprising!

[rosshaden]

Amazing ! I found it very helpful.