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

["Steven M. Bellovin" <smb () research att com>]

In message <Pine.LNX.4.44.0305140802170.7544-100000 () 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)