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Mohamed,
If I have understood this correctly, you need to create an access-list on R1(the NTP master) and apply this access-group to the ntp.
The below configuration allows R1 to service only the requests coming from 172.16.12.1 to 172.16.12.255.
R1 access-list 11 permit 172.16.12.0 0.0.0.255 ! ntp access-group serve 11 ntp master 2
The NTP server will receive the time requests from other devices, if they are configured with R1 as the NTP server, but would not service them. If you run a an ntp debug you will see the following only to the devices, the NTP server is servicing the time requests. NTP: stateless xmit packet to 172.16.12.1
HTH, Shine
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of mohamed ouamer Sent: Saturday, 5 April 2008 10:58 PM To: Sadiq Yakasai; ccielab@groupstudy.com Subject: RE: NTP master
Thank you for your patience.
The task says “configure NTP on R1 to service only vlan 40 users”.> Date: Sat, 5 Apr 2008 12:48:02 +0100> From: sadiqtanko@gmail.com> To: mohamedouamer@hotmail.com> Subject: Re: NTP master> > can you be a little bit more specific? _________________________________________________________________ Sur Windows Live Ideas, dicouvrez en exclusiviti de nouveaux services en ligne… si nouveaux qu’ils ne sont pas encore sortis officiellement sur le marchi ! http://ideas.live.com