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Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

Sidewinder G2 6.1.2 Administration Guide - Glossary of Technical ...

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Using command<br />

line:<br />

Appendix B: Setting Up Network Time Protocol<br />

References<br />

2 Enable the NTP server in the appropriate burbs, as follows:<br />

a Select Services Configuration > Servers, and select NTP from the<br />

Server List. The NTP Control tab appears.<br />

b Select the check box for the burbs in which you want NTP enabled.<br />

c Click the Save icon in the toolbar.<br />

3 At the command line, connect to the <strong>Sidewinder</strong> <strong>G2</strong> and enter the srole<br />

command.<br />

4 Create a local clock by entering the following command:<br />

cf ntp add peer burb=burb_name ip=127.127.1.0 prefer=yes<br />

Setting prefer=yes specifies that the <strong>Sidewinder</strong> <strong>G2</strong>’s time signals take<br />

precedence over a set <strong>of</strong> correctly operating servers that are also sending<br />

the time.<br />

5 (Optional: Perform if configuring the <strong>Sidewinder</strong> <strong>G2</strong> as an authoritative NTP<br />

clock) Add a list <strong>of</strong> NTP peers that can query the <strong>Sidewinder</strong> <strong>G2</strong> by entering<br />

the following command:<br />

cf ntp add peer burb=peer_burb ip=ip_addr<br />

An NTP peer is a server that is a designated “colleague” to another server<br />

(peers can set each other’s clocks). Peers are sometimes used in large,<br />

internationally-known time sites.<br />

6 (Optional: Perform if configuring the <strong>Sidewinder</strong> <strong>G2</strong> as an authoritative NTP<br />

clock): Set up the NTP rules by entering the following command:<br />

cf ntp add restrict burb=burb_name ip=restricted_ip_<br />

address_or_subnet mask=network_mask_for_ip_address<br />

flags=comma_separated_lists_<strong>of</strong>_flags: notrust, noquery,<br />

etc.<br />

Note: Flags are used to restrict the NTP functions <strong>of</strong> a server, peer, or client.<br />

Refer to man cf_ntp for details.<br />

References NTP is a complicated protocol with many options. There are numerous places<br />

where more information can be obtained. These include RFCs, Web sites, and<br />

local manual (man) pages. For more information about NTP, see the following<br />

sources:<br />

Internet Request For Comments (RFC)<br />

The following RFCs provide information on NTP:<br />

• RFC 1059 Network Time Protocol (Version 1)<br />

• RFC 1119 Network Time Protocol (Version 2)<br />

• RFC 1305 Network Time Protocol (Version 3)<br />

599

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