Red Hat NETSCAPE MANAGEMENT SYSTEM 6.0 - COMMAND-LINE Instrukcja Użytkownika Pobierz pdf (Strona 32)

Setup NTP for Synching Time

For more information, all of the following have good information:

• http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch24_:_The_

NTP_Server

• http://www.brennan.id.au/09-Network_Time_Protocol.html

• http://ntp.isc.org/bin/view/Support/AccessRestrictions

• http://www.eecis.udel.edu/~mills/ntp/html/accopt.html

Note that this configuration is for a protected, internal server, NOT an Internet accessible server.

That is, you trust (relatively so) the clients on your internal network.

Configure NTP

√

Description

Backup

First backup your original ntp.conf file:

cp /etc/ntp.conf /etc/ntp.conf.orig

Locate an

Internet Time

Server

Go to http://ntp.isc.org/bin/view/Servers/WebHome and locate 2 or 3 servers

in your timezone, near you geographically.

For illustration purposes, we’ll suppose you gathered the following three

servers:

198.30.92.2

128.10.252.7

130.126.24.44

Configure the

Server

Create a new /etc/ntp.conf file and place the following contents in the

file:

This first line will ignore all connections by default.:

# Ignore all NTP connections by default

restrict default ignore

Allow full control of our time service from the local host – while the statement

seems odd (restrict) it really means allow with the following restrictions –

which there will be none:

# Allow full access from localhost

restrict 127.0.0.1

Now enter the IP addresses of the servers you chose to update from:

# Servers and their restrictions

server 198.30.92.2

server 128.10.252.7

server 130.126.24.44

Set the restrictions for our upstream servers

restrict 198.30.92.2 mask 255.255.255.255 nomodify

restrict 128.10.252.7 mask 255.255.255.255 nomodify

restrict 130.126.24.44 mask 255.255.255.255 nomodify

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