284 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
1
# W A R N I N G ! ! ! Microsoft Internet Explorer complications...
# 1) Do not use a full colon character - even in comments!
# 2) If this file does not submit, it has too many characters in it and you
# must shorten this file. Do this by eliminating the pound sign comments.
# ALL servers are optional - when GPS is synchronized. The first server
# in the list is the "Trusted Server". The following are public Symmetricom NTP
# Timeservers.
#server 69.25.96.11
#server 69.25.96.12
# Private time servers (example only).
#server 192.168.1.35
# Uncomment the "broadcast" line below to enable NTP broadcast mode with MD5
# using key 1. The key may be omitted, but is less secure. If a key is used
# here, a corresponding entry for that key must appear in the NTP key file. A
# maximum of 20 keys for broadcast can be defined on this line.
#broadcast 192.168.1.255 key 1
# Command below lists trusted keys. See NTP keys file for the actual keys and
# key numbers. Keys ID's 1 and 2 are examples. A maximum of 20 trusted keys
# can be defined on this line.
#trustedkey 1 2
Editing MD5 keys on the NTP Server
NTP keys are needed if you are using NTP in broadcast mode with MD5 authentication. This (and the
following) section provide configuration guidelines. For additional information, consult Dr. Mills NTP site
at: http://www.ntp.org
Broadcast mode adjusts its periodicity according to feedback from its broadcast client. The periodicity
will typically settle-out to about every 2 minutes. This activity is not adjustable.
MD5 private keys have to be edited on both the NTP server and the NTP client. The private keys are
defined in the “ntp.keys” file.
The NTP client “ntp.keys” file is identical to the one on the NTP server. For the specific keys
used by the NTP server, the NTP client must have the identical line in its version of the file. You’ll want to
use your own hard-to-guess key names, using random letters. The critical lines of the “ntp.keys” file are:
1 M truetime
2 M TTXli
where:
• “1” and “2” are the key identifiers
• “M” specifies MD5 authentication, the only type available
• “truetime” and “TTXli” are the arbitrarily chosen keys
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