Hi Frank, thanks, didn't know that. Tested for it: $ for h in mdns adns1 adns2 ; do docker exec -it "$h" date +'%Y/%m/%d %H:%M:%S.%N' ; done 2021/11/07 10:19:24. 2021/11/07 10:19:24. 2021/11/07 10:19:24. They are within one second of each other. Jan. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.nlnetlabs.nl/pipermail/nsd-users/attachments/20211107/130c56ab/attachment.htm>