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ntp: avoid truncation of NTPv4 MACs by default

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If the MAC in NTPv4 requests would be truncated, use version 3 by
default to avoid the truncation. This is necessary for compatibility
with older chronyd servers, which do not respond to messages with
truncated MACs.
This commit is contained in:
Miroslav Lichvar
2016-11-29 13:26:46 +01:00
parent 1d5d768545
commit e6e9a472db
5 changed files with 34 additions and 9 deletions
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10
doc/chrony.conf.adoc
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@@ -215,9 +215,13 @@ avoid selecting that source. This is useful with low stratum sources that are
known to be unreliable or inaccurate and which should be used only when other
sources are unreachable.
*version* _version_:::
This option sets the NTP version number used in packets sent to the server.
This can be useful when the server runs an old NTP implementation that does not
respond to newer versions. The default version number is 4.
This option sets the NTP version of packets sent to the server. This can be
useful when the server runs an old NTP implementation that does not respond to
requests using a newer version. The default version depends on whether a key is
specified by the *key* option and which authentication hash function the key
is using. If the output size of the hash function is longer than 160 bits, the
default version is 3 for compatibility with older *chronyd* servers. Otherwise,
the default version is 4.
[[pool]]*pool* _name_ [_option_]...::
The syntax of this directive is similar to that for the <<server,*server*>>