[c-nsp] NTP Config

[Sridhar Ayengar]

Justin Shore wrote:
> 1) Always use authentication between your local peers.  Ideally you 
> would also take advantage of NIST's offer of authenticated NTP (or make 
> arrangements with another provider with whom you peer).

This isn't a big deal if all of the devices are behind a firewall.  You 
can just drop the NTP packets trying to cross the firewall.

> 3) Pick at least a couple stratum 1 or 2 servers external to your 
> network, even if you have a local GPS or WWVB radio.
> 
> 5) Ask before you use an external NTP server that doesn't give implicit 
> permission for everyone to query it (ie, isn't listed on NIST's NTP 
> server page).

I tend to use tick and tock (.usno.navy.mil) for my stratum-2 servers. 
There are others which allow public access, but why not just go to the 
horse's mouth?

Peace...  Sridhar