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  1. #1

    Exclusive access for few IPs to NTP device

    How to provide a client exclusive access to the NTP device or NTP server.

    1. Configured md5 authentication for a subnet added below restriction line to the subnet as below in ntp.conf file. Also configured the keys and md5 authentication working .

    restrict mask nomodify noquery nopeer notrust

    Question 1: Now how to provide just plain exclusive (non md5 authentication) to some of the IPs from the subnet.

    Question 2: Any order to follow in ntp.conf file. Which will be precedence over the other.

    Can you please let me know.

    Appreciate your help.

  2. #2
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    Have you tried this:

    restrict -4 mask nomodify notrap
    restrict -4 mask nomodify notrap

    You can also disable keyed authentication on the server with the --authnoreq option on the command line or in /etc/sysconfig/ntpd.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

  3. #3
    Thank you so much for your reply.

    I tried as below
    restrict mask nomodify nopeer noquery
    restrict mask nomodify nopeer noquery


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