YaST/Modules/NTP Client

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Network Time Protocol information

The Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems over variable-latency networks. NTP uses UDP on port 123. Additional references on the protocol are listed below.

• Wikipedia entry
• NTP site

Configuration

Version 10.2

For Network Manager users:

• Configure the NTP Client from YaST->Network Services->NTP Configuration
• Ignore the warning when selecting Automatically start NTP daemon->During Boot - there is no significant delay.
• Add servers per recommendation at http://www.pool.ntp.org. For example:

server 0.us.pool.ntp.org
server 1.us.pool.ntp.org
server 2.us.pool.ntp.org

• Ensure NTP is enabled in System->System Services (Runlevel) and then restart the daemon.

Version 11.1

Step 1

Open Yast, Network Services, NTP Configuration.

Step 2

Select General Settings tab, click Add.

Step 3

Click Server, Public Server.

Step 4

Select a public server near your physical location, or use the recommendations of http://www.pool.ntp.org. Test the server as required. If the server is unreachable, verify the OpenSuse firewall settings (Step 6) or your ISP's gateway/firewall settings (Step 9).

Step 5

If the host is a client (and not a time server for the domain or network), remove the ibusrt option.

Step 6

Select Security Settings tab, click Open Port in Firewall.

Step 7

Click Firewall Details and select the appropriate interfaces.

Step 8

Verify settings and the server list built in previous steps.

Step 9

Finally, punch a hole in your ISP's gateway/firewall as required. Outgoing, Port 123, UDP.