Editing Md5 Keys On The Ntp Client - Symmetricom XLi User Manual

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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:
trustedkey 1
bclient
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.
Sample information in a client "ntp.keys" file might look like:
1 M truetime
2 M 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
– d
for debugging.
An example command line might look like:
ntpd –d –d –d –b
Important lines in the ntp.conf file of the ntp client (not server) are:
trusted key 1
If you do not use MD5 authentication, remove # from "#disable auth".
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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2
–k /etc/ntp.keys
2
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2
1
5
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