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conf: add dscp directive

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The directive sets the DSCP value in transmitted NTP packets, which can
be useful in local networks where switches/routers are configured to
prioritise packets with specific DSCP values.
This commit is contained in:
Miroslav Lichvar
2020-08-03 17:55:42 +02:00
parent e5cf006378
commit 6a5665ca58
4 changed files with 36 additions and 1 deletions
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13
doc/chrony.conf.adoc
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@@ -652,6 +652,19 @@ An example of the directive is:
bindacqdevice eth0
----
[[dscp]]*dscp* _point_::
The *dscp* directive sets the Differentiated Services Code Point (DSCP) in
transmitted NTP packets to the specified value. It can improve stability of NTP
measurements in local networks where switches or routers are configured to
prioritise forwarding of packets with specific DSCP values. The default value
is 0 and the maximum value is 63.
+
An example of the directive (setting the Expedited Forwarding class) is:
+
----
dscp 46
----
[[dumpdir]]*dumpdir* _directory_::
To compute the rate of gain or loss of time, *chronyd* has to store a
measurement history for each of the time sources it uses.