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Ntp problem

Hi, everybody!

Recently, I've tried to establish the NTP server on my Cisco 2811. I thought it quite easy, but after a couple of days I understood that the task is not as obvious as it seems.

There is part of my configuration related to NTP:

     ntp access-group peer 21

     ntp access-group serve-only 20

     ntp update-calendar

     ntp server

     ntp server yyy.yyy.yyy.yyy prefer

     access-list 21:

          10 permit yyy.yyy.yyy.yyy

          20 permit

     access-list 20:

          10 permit, wildcard bits

The problem itself is that users can only sync with my NTP server when I add them to the access-list 21 but it shouldn't be like that! It seems to me that option "ntp access-group serve-only" doesn't work at all.

Please help! Thanks in forward!

P.S. ios Version 15.1(1r)T4

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