[pkg-ntp-maintainers] Bug#416818: Add documentary comments to /etc/ntp.conf

[rjanke at blueyonder.co.uk]

Package: ntp
Version: 1:4.2.0a+stable-8

This is a bug submitted to ubuntu, that I would like to forward upstream:

I wanted to restrict access to ntpd, such that only clients on my local
network could query my server. (I use a firewall, but I wanted a belts and
braces approach.) I configured what I thought was a suitable /etc/ntp.conf
file, but I found that ndpd wasn't syncing:
ntpq -p
      remote refid st t when poll reach delay offset jitter
 ==============================================================================
  fiordland.ubunt .INIT. 16 u - 1024 0 0.000 0.000 4000.00
  ntp0.zen.co.uk .INIT. 16 u - 1024 0 0.000 0.000 4000.00
Eventually I realised that "restrict" applies to servers as well as
clients, and I'd set up ntpd to ignore replies from the servers I'd
configured.
I attach a patch to /etc/ntp.conf to point to the support documentation at
ntp.isc.org as well as the local documentation in /usr/share/doc/.
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