North American Network Operators Group

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

  • From: Steven M. Bellovin
  • Date: Wed May 14 13:37:27 2003

In message <[email protected]>, 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)