NTP Server

[Karthikeyan Shanmugam]

Hi,

I want to configure NTP server for my Router,Switch and Firewall. how do i configure in my domain server?.which one is secure, internal NTP server or Public(Internet) NTP server. please help me.

[andrew.prince]

Use the NTP server provided from your ISP.

You only have to make sure you are going to "GET" the time, and your device should not have the time PUSHED to it.

[Karthikeyan Shanmugam]

Thanks.

[Leo Laohoo]

I wouldn't configure Cisco appliance as an authoritative NTP server.

If you have Windows servers, you can configure them to be an authoritative NTP server.

How to configure an authoritative time server in Windows XP
http://support.microsoft.com/kb/314054

How to configure an authoritative time server in Windows Server
http://support.microsoft.com/kb/816042

How to configure an authoritative time server in Windows 2000
http://support.microsoft.com/kb/216734

Otherwise, use a dedicated NTP server that synchronizes itself using GPS.

[Karthikeyan Shanmugam]

Thanks.

[Naveen Kumar Rajaharia]

It would be always to have an internal NTP server as this would reduce your RTD to reach it from various devices. Moreover, you can have a connection from internal NTP server to an external Stratum server (possibly internet) which would keep the time updated.

[Karthikeyan Shanmugam]

Thanks.

[Petar Milanov]

Hi,

I would suggest you to configure your internet connected device (I don't know in your case witch is it) as an NTP master and make it syncronize with public NTP servers. You can get a list of public NTP servers here http://www.pool.ntp.org/en/ . On the site chose your area and configure at least 3 NTP servers. For example

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

#ntp master

Now your internet facing device is syncronized to the world clock. Next step is to configure your other devices to synch with your master.

#ntp server X.X.X.X (This is the inside IP of your internet facing device)

And you are done. Now you have synchronized internal network witch is synchronized to the world clock.

Regards,

Tihomir Yosifov

[Karthikeyan Shanmugam]

Thanks.