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Bluestar Linux - Overview

 

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    Recommended Settings for /etc/ntp.conf
    Submitted By: admin Date: May 10, 2013, 02:54:19 AM Views: 1438

    Server Settings

    Code: [Select]
    server 0.pool.ntp.org iburst
    server 1.pool.ntp.org iburst
    server 2.pool.ntp.org iburst
    server 3.pool.ntp.org iburst

    Adding iburst to the server definitions tells ntp to send a burst of 8 request packets if the time server is unreachable. There is also a burst option which, according to the documentation, will send a burst of 8 request packets each time a request is made when the server is reachable - this setting is normally not recommended.


    Access Control Settings

    Code: [Select]
    restrict -4 default kod nomodify notrap noquery nopeer
    restrict -4 127.0.0.1
    # restrict -6 ::1

    The -4 designation forces IPv4 DNS resolution. Use -6 for IPv6.

    kod - If this flag is set when an access violation occurs, a kiss-o?-death (KoD) packet is sent. KoD packets are rate limited to no more than one per second. If another KoD packet occurs within one second after the last one, the packet is dropped.

    nomodify - Deny ntpq and ntpdc queries which attempt to modify the state of the server (i.e., run time reconfiguration). Queries which return information are permitted.

    notrap - Decline to provide mode 6 control message trap service to matching hosts. The trap service is a subsystem of the ntpdq control message protocol which is intended for use by remote event logging programs.

    noquery - Deny ntpq and ntpdc queries. Time service is not affected.

    nopeer - Deny packets which would result in mobilizing a new association. This includes broadcast and symmetric active packets when a configured association does not exist.


    Miscellaneous Settings

    Code: [Select]
    driftfile /var/lib/ntp/ntp.drift
    logfile /var/log/ntp.log

    These should be self-explanatory.

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