[ntp:questions] Compensating for asymmetric delay on a per-peer/server basis?

Rob nomail at example.com
Fri Sep 12 07:58:46 UTC 2014

Martin Burnicki <martin.burnicki at meinberg.de> wrote:
> - NAT doesn't hurt at all, unless you are trying to use NTP's authentication

NAT in itself does not hurt, but when you want to be a timeserver for
a large number of clients, it can be a problem.

Many home routers have no "static NAT" but only "portforwarding" which
creates dynamic NAT entries on demand.  As UDP has no session concept,
such NAT entries have a lifetime of usually a couple of minutes.

When you serve thousands of clients, this tends to overflow the NAT
table or stress the lookup code so much that it overloads the CPU.

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