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Re: NTp sources that work in a datacenter (was Re: Is latency equivalentto RTT?)
- From: N. Richard Solis
- Date: Wed May 14 13:40:36 2003
IIRC, NTP actually sends a packet with a local timestamp, sends it to a
remote location for a remote timestamp, and then checks the local
timestamp when the packet is received to calculate RTT.
Steven M. Bellovin wrote:
[email protected]"><[email protected]>, Joel
>Also if you just need a high level of syncronization between the
>all your hosts you can just deploy one standalone ntp server, sync
>against public time sources and get everything synced against that.
>probably a 95% solution to most people's timeing needs.
If I recall correctly, NTP assumes that latency = RTT/2. You might
make it work well for his application *if* you set up your tree so that
your paths are each one hop, or at least symmetric over your network.
--Steve Bellovin, http://www.research.att.com/~smb
(2nd edition of "Firewalls" book)