NTP with no antenna ?

We'll be dropping in a small network ( a couple routers, a dozen servers) into a facility with no roof access.  We will have a DSL connection for VPNs.   We are planning on using Symetricon NTP servers, and can possibly upgrade to their rubidium flywheel.   We only need accurate time down to the second.

What are the best options for accurate time?
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pergrConnect With a Mentor Commented:
If you are not going to use GPS as your clock source, then you will have to use NTP over the internet to other NTP servers.

So you have to chose which NTP software to use (possibly the Symetricom) and you have to chose your NTP servers to get time from.

For the NTP software, I would chose the NTP software that comes with any linux distributions. Very easy to handle, and works very well. I would even consider running two NTP servers - perhaps as VMs on any two of your dozen servers. Another option is to use the routers as NTP servers - meaning you use the router OS as your NTP software.

Each of your other devices should then take time from your two local NTP servers.

As source NTP servers, reachable over the internet, it is important to have several - at least 5-6 of them, for each of your two local NTP servers. If you have any remotely accessible private servers, then use them. IF not, just pick a few from "pool.ntp.org".


There are also some other publicly available servers, as at LINX (London Internet Exchange).

With the above you can be very certain that you will have accurate time down to the second.
jimmycherAuthor Commented:
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