Download XLi Time & Frequency System

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The first column is the key identification number, which may range in whole positive numbers from 1 to
65,535. The second column is the type of key, which is always set to the letter M when using MD5
authentication. The third column is the private key that is ASCII text from 1 to 32 characters in length.
Up to eight MD5 can be established.
Editing MD5 keys on the NTP Client
For NTP client authentication, the line trustedkey 1 2 in the “ntp.conf” file is required to enable the
private keys 1 and 2 from the “ntp.keys” file. The line bclient is required for broadcast time packets to
be processed by the NTP client. In this case, sample information from a client “ntp.conf” file might look
like:
2
trustedkey
bclient
1
2
Network Time Protocol (NTP) does not permit comments in the ntp.keys files. Inserting comments will
prevent the ntp.keys files from being parsed correctly and turns off authentication at initialization.
1
Sample information in a client “ntp.keys” file might look like:
1
2
M
M
truetime
TTXli
When you invoke the NTP client at the command line, use the following options:
–
b
to turn on broadcast reception
–
k /etc/ntp.keys
to specify the name and location of the keys file
5
–
d
for debugging.
An example command line might look like:
ntpd –d –d –d –b
–k /etc/ntp.keys
Important lines in the ntp.conf file of the ntp client (not server) are:
trusted key
1
2
If you do not use MD5 authentication, remove # from “#disable auth”.
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
285