14.17.12. Configuring Symmetric Authentication Using a Key
To configure symmetric authentication using a key, add the following option to the end of a server or peer command:
key
number
where
number is in the range
1
to
65534
inclusive. This option enables the use of a
message authentication code (
MAC) in packets. This option is for use with the
peer
,
server
,
broadcast
, and
manycastclient
commands.
The option can be used in the
/etc/ntp.conf
file as follows:
server 192.168.1.1 key 10
broadcast 192.168.1.255 key 20
manycastclient 239.255.254.254 key 30