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List: ipcop-svn
Subject: [Ipcop-svn] SF.net SVN: ipcop: [1516] IPCopDoc/trunk/en/admin
From: eoberlander () users ! sourceforge ! net
Date: 2008-06-15 15:23:04
Message-ID: E1K7u4O-0004II-Gx () sc8-pr-svn4 ! sourceforge ! net
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Revision: 1516
http://ipcop.svn.sourceforge.net/ipcop/?rev=1516&view=rev
Author: eoberlander
Date: 2008-06-15 08:23:03 -0700 (Sun, 15 Jun 2008)
Log Message:
-----------
Update time server section.
Modified Paths:
--------------
IPCopDoc/trunk/en/admin/images/time.png
IPCopDoc/trunk/en/admin/images/time2.png
IPCopDoc/trunk/en/admin/xml/services.xml
Modified: IPCopDoc/trunk/en/admin/images/time.png
===================================================================
(Binary files differ)
Modified: IPCopDoc/trunk/en/admin/images/time2.png
===================================================================
(Binary files differ)
Modified: IPCopDoc/trunk/en/admin/xml/services.xml
===================================================================
--- IPCopDoc/trunk/en/admin/xml/services.xml 2008-06-15 15:22:02 UTC (rev 1515)
+++ IPCopDoc/trunk/en/admin/xml/services.xml 2008-06-15 15:23:03 UTC (rev 1516)
@@ -903,8 +903,8 @@
</sect2><sect2 id="services_time">
<title>Time Server Administrative Web Page</title>
<para>
- IPCop can be configured to obtain the time from a known accurate \
timeserver
- on the Internet. In addition to this it can also provide this time to \
other + IPCop can be configured to obtain the time from known accurate \
timeservers + on the Internet. In addition, it can also provide this time \
to other machines on your network.
</para><para>
<figure id="v140.services.008">
@@ -922,10 +922,12 @@
</mediaobject>
</figure>
</para><para>
- To configure the time system, make sure that the \
<guilabel>Enabled</guilabel>
- box is ticked and enter the full name of the timeserver you want to use \
in + To configure the time system, check the
+ <guilabel>Obtain time from a Network Time Server</guilabel>
+ checkbox and enter the full name of the timeserver you want to use in
the <guilabel>Primary NTP Server</guilabel> box. You can also enter an \
optional
- <guilabel>Secondary NTP Server</guilabel> if you want.
+ <guilabel>Secondary NTP Server</guilabel> or
+ <guilabel>Tertiary NTP Server</guilabel> if you want.
</para>
<para>
We suggest that, for efficiency, you synchronize IPCop with your \
ISP's time @@ -946,62 +948,11 @@
instead of the previous default zone names.
</para>
<para>
- If you want to provide a time service to the rest of your network then \
tick the
- <guilabel>Provide time to local network</guilabel> checkbox.
+ IPCop will provide a time service to the rest of your
+ network when the NTP Server is enabled.
</para><para>
- You can choose to update the time on IPCop on a periodic basis, for \
instance every hour,
- or to update it when you wish from this web page (just click \
<guilabel>Set Time Now</guilabel>).
- </para><para>
To save your configuration click the <guilabel>Save</guilabel> button.
</para>
- <note>
- <para>
- Although IPCop can act as a timeserver for your network, it uses the \
- <command>ntpdate</command> command to update
- its time on a periodic basis instead of allowing the more accurate \
ntpd server to maintain
- the time continuously. This means that the IPCop clock is more \
likely to drift out of
- synchronisation with the real time but does not require that IPCop \
is permanently connected
- to the Internet.
- </para>
- </note>
- <note>
- <title>How to improve IPCop's clock accuracy</title>
- <para>
- If you find IPCop's onboard clock is being stepped by a large \
amount
- when it synchronizes with another NTP Server, you can apply a \
correction
- factor in the <filename>/etc/ntp/drift</filename> file to \
compensate.
- </para>
- <para>
- You can find the step amount in the <emphasis>System \
Logs</emphasis>,
- in the <emphasis>NTP</emphasis> section. You should see something \
like:
- </para>
- <para>
- <computeroutput>
- 10:40:00 ntpdate step time server 192.168.1.1 offset 3.371245 \
sec
- </computeroutput>
- </para>
- <para>
- If you divide the time error by the time passed, and multiply by one
- million, you get the value (in parts per million) to put in
- <filename>/etc/ntp/drift</filename>
- </para>
- <para>
- In the example below, 3.37 is the daily offset; 86400 equals the \
number
- of seconds in a day; and the result in PPM is 39.004:
- </para>
- <para>
- <computeroutput>
- (3.37 ÷ 86400 × 1000000) = 39.004
- </computeroutput>
- </para>
- <para>
- Change the value in the drift file with the command (as root):
- </para>
- <para>
- <screen \
format="linespecific"><prompt>$ </prompt><userinput>echo 39.004 > \
/etc/ntp/drift</userinput>
- </screen>
- </para>
- </note>
<para>
<figure id="v140.services.009">
<title>Update the time manually</title>
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