HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1m/naaagt.1m
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x
xntpd(1M) xntpd(1M)
clock oscillator. If the file exists, it is read at startup in order to set the initial frequency
offset and then updated once per hour with the current frequency offset computed by the
daemon. If the file does not exist or this command is not given, the initial frequency offset
is assumed zero. In this case, it may take some hours for the frequency to stabilize and the
residual timing errors to subside.
enable auth|bclient|monitor|pll|pps|stats
disable auth|bclient|monitor|pll|pps|stats
Provides a way to enable or disable various server options. Flags not mentioned are
unaffected. Note that all of these flags can be controlled remotely using the xntpdc utility
program. Each of these flags are described below.
auth Enables the server to synchronize with unconfigured peers only if the peer has
been correctly authenticated using a trusted key and key identifier. The default for
this flag is disable.
bclient
Enables the server to listen for a message from a broadcast or multicast server, as
in the multicastclient command with default address. The default for this flag is
disable.
monitor
Enables the monitoring facility. See the xntpdc monlist command for further
information (xntpdc(1M)).
pll Enables the server to adjust its local clock, with default enable. If not set, the local
clock free-runs at its intrinsic time and frequency offset. This flag is useful in case
the local clock is controlled by some other device or protocol and NTP is used only
to provide synchronization to other clients. In this case, the local clock driver is
used. See the Reference Clock Drivers for further information.
pps Enables the pulse-per-second (PPS) signal when frequency and time is disciplined
by the precision time kernel modifications. The default is enable when these
modifications are availableand disable otherwise.
stats Enables the statistics facility. By default this option is enabled.
Authentication Key File Format
The NTP standard specifies an extension allowing verification of the authenticity of received NTP packets,
and to provide an indication of authenticity in outgoing packets. This is implemented in xntpd using the
DES encryption algorithm. The specification allows any one of a possible 4 billion keys, numbered with 32
bit unsigned integers, to be used to authenticate an association. The servers involved in an association
must agree on the value of the key used to authenticate their data, though they must each learn the key
independently. The keys are standard 56 bit DES keys.
Additionally, another authentication algorithm is available which uses an MD5 message digest to compute
an authenticator. The length of the key or password is limited to 8 characters.
xntpd reads its keys from
a file specified using the -k command line option or the keys statement in the configuration file. While key
number 0 is fixed by the NTP standard (as 56 zero bits) and may not be changed, one or more of the keys
numbered 1 through 15 may be arbitrarily set in the keys file.
The key file uses the same comment conventions as the configuration file. Key entries use a fixed format of
the form
keyno type key
where keyno is a positive integer, type is a single character which defines the format the key is given in,
and key is the key itself.
The key may be given in one of four different formats, controlled by the type character. The four key types,
and corresponding formats, are listed following.
S The key is a 64 bit hexadecimal number in the format specified in the DES document, that is the high
order 7 bits of each octet are used to form the 56 bit key while the low order bit of each octet is given a
value such that odd parity is maintained for the octet. Leading zeroes must be specified (i.e. the key
must be exactly 16 hex digits long) and odd parity must be maintained. Hence a zero key, in standard
format, would be given as 0101010101010101 .
Section 1M−−1066 − 3 − HP-UX Release 11i: December 2000
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