NTp sources that work in a datacenter (was Re: Is latency equivalent to RTT?)

Steven M. Bellovin smb at research.att.com
Wed May 14 16:38:43 UTC 2003

In message <Pine.LNX.4.44.0305140802170.7544-100000 at twin.uoregon.edu>, Joel Jae
ggli writes:
>Also if you just need  a high level of syncronization between the time on 
>all your hosts you can just deploy one standalone ntp server, sync it 
>against public time sources and get everything synced against that. its 
>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 (me)
		http://www.wilyhacker.com (2nd edition of "Firewalls" book)

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