From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Feb 06 2004 - 18:54:04 GMT-3
Ken,
The point of the command is to show that it is not required and has
no effect. The 'ntp authenticate' command instructs the router to issue an
authentication challenge to servers or peers that have an associated
authentication key configured. In case II of the paper, the client is not
challenging the server. Therefore the authentication configuration on the
server does not have any effect.
http://www.internetworkexpert.com/resources/01700369.htm
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Kenneth Wygand
> Sent: Friday, February 06, 2004 2:55 PM
> To: ccielab@groupstudy.com
> Subject: Ping Brian McGahan - Your NTP Paper
>
> Brian,
>
>
>
> This question relates to your white paper on NTP
> (internetworkexpert.com), but can also be answered by the group.
>
>
>
> In the cases you list, case II is "Authentication on Master (R1) Only"
> and case IV is "Authentication on Master (R1) and Client (R2)".
>
>
>
> The configuration for R1 in case II is as follows:
>
>
>
> <snip>
>
> R1(config)#ntp master 1
>
> R1(config)#ntp authenticate
>
> R1(config)#ntp authentication-key 1 md5 CISCO
>
> <snip>
>
>
>
> Yet the configuration for R1 in case IV is as follows:
>
>
>
> <snip>
>
> R1(config)#ntp master 1
>
> R1(config)#ntp authentication-key 1 md5 CISCO
>
> <snip>
>
>
>
> Note the command "ntp authenticate" is listed in R1's configuration in
> case II but not in case IV. The description on both cases is that
> Authentication *IS* enabled on R1. Was this done intentionally, and if
> so, why is "ntp authenticate" only required in case II.
>
>
>
> Thanks!
>
>
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
>
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
>
> "Success is to be measured not so much by the position one has reached
> in life as by the obstacles which he has overcome while trying to
> succeed."
> -Booker Taliaferro Washington
>
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