ntpdate

[Craig White]

On Mon, 2005-08-29 at 17:54 +0200, Albert A. Modderkolk wrote:
> I would like to make a cron ntpdate job but I know that I have to open a
> certain port.  Which is it and how do I do that?
> 
----
for outbound connections to an ntp server, you shouldn't need to open
any port at all.

if you think you need an open port for others to connect to your time
server...

# grep ntp /etc/services
ntp             123/tcp
ntp             123/udp                         # Network Time Protocol

snipped other stuff

but you need to consider the issues of security if you open the port for
others to connect

Craig