setup a local ntp server on debian

[Israel Garcia <igalvarez@gmail.com>]

We've been increasing in numbers of debian lenny servers and they has
a cron.hourly as follow:

#!/bin/bash
/usr/sbin/ntpdate -u swisstime.ethz.ch

We're planning to setup our NTP's servers only to serve our local
boxes. I've some questions for you:

1. Which do you suggest to use? openntpd or ntp server?
2. Can I setup redundancy with any of them?
3. What client should I use to synchronize other boxes clock? ntpdate
command  or ntp daemon client?
4. Should I use a local NTP or do you suggest all client synchronize
to an external server?

-- 
Regards;
Israel