[ntp:questions] NTP and NAT
Richard B. Gilbert
rgilbert88 at comcast.net
Thu Nov 8 14:23:07 UTC 2007
Daniel Guerrero wrote:
> I'm a newbie on NTP, and i would like to know if there is any problem in
> configuring more than one machine with the same NTP server on a LAN that
> connects to the internet through a NAT (with the same outgoing IP for
I've done it. It works.
Normally, you should not have more than one local client per outside
server. If you need to synch several machines, make one the master that
synchs to the outside server(s) and have the rest synch to your internal
server. Many of the stratum one and two servers are staggering under
the load caused by misconfigured clients, see; e.g.
and that is by no means the only example. Some of the others can be
found by googling for "Poul Henning Kamp D-Link" and "Tardis NTP".
Remember: more than 40% of the population has subnormal intelligence. :-)
If you are setting up a configuration that requires maximum robustness,
you would use four internal servers synchronized from a set of seven or
more external servers. Each internal server would use a different set
of external servers. Not everyone needs this level of robustness!
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