NTP Master authentication

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Jun 17th, 2009
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I an using MD5 authentication in NTP. On the client side, I can use NTP server x.x.x.x key 1 & all related command.

What to do with NTP Master router ? how to configure authentication so that client can authenticate ?

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thotsaphon Wed, 06/17/2009 - 08:29
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When you configure NTP authentication at the client you have to configure NTP authentication at the MASTER as well.

Router(config)#ntp master 1

Router(config)#ntp authentication-key 1 md5 JUSTKIDDING

Note: You can only configure this on the MASTER router. The client who hasn't been configured NTP authentication can synchronize to that MASTER as well. (grin)

Edit: You may know how to configure this at the client. I just want to share you what I have in mind. (grin)

Client(config)#ntp authenticate

Client(config)#ntp authentication-key 1 md5 JUSTKIDDING

Client(config)#ntp trusted-key 1

Client(config)#ntp server x.x.x.x key 1




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