[ntp:questions] NTP timestamps
cswiger at mac.com
Tue May 25 21:47:53 UTC 2010
On May 25, 2010, at 2:20 PM, Ray wrote:
> Thanks again. tcpdump shows the content of the NTP packet.
> The destination (or return) timestamp is not in there. It is stamped by the NTP daemon itself.
Right-- if you are running tcpdump on the machine running NTPd, then the timestamp of when tcpdump sees the packet is probably going to be a little before the exact time when NTPd will see it. Otherwise, if you are snooping traffic in the middle, you just see the timestamps which are present in the packet.
> I am also looking for a Linux version so that I can monitor a stratum-1 server, against a remote server, to see network delays.
> Any ideas would be appreciated.
Are you looking for tracking the offset against some remote server and graphing it like the NTP pool does, for example:
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