View the server's restrict list, Field descriptions, View the server's restrict list -40 – Alcatel Carrier Internetworking Solutions Omni Switch/Router User Manual
Page 318
NTP Access Control Menu
Page 12-40
limited
These hosts are subject to a limitation of the number of clients
from the same net. Net in this context refers to the IP notion of
net (class
A
, class
B
, class
C
, etc.). Only the first client limit
hosts that have shown up at the server and that have been
active during the last client limit period (in seconds) are
accepted. Requests from other clients from the same net are
rejected. Only time request packets are taken into account.
Query packets sent by the ntpq and xntpdc programs are not
subject to these limits. A history of clients is kept using the
monitoring capability of xntpd. Thus, monitoring is always
active as long as there is a restriction entry with the limited flag.
For more information on enabling monitoring, see Turn the
Server's Monitoring Facility On or Off on page 12-31.
ntpport
This is actually a match algorithm modifier, rather than a restric-
tion flag. Its presence causes the restriction entry to be matched
only if the source port in the packet is the standard
NTP
UDP
port (123). Both
ntpport
and
non-ntpport
may be specified. The
ntpport
is considered more specific and is sorted later in the list.
View the Server's Restrict List
The
ntpvres
command allows you to view a list of all the configured restrictions for the
switch. To view a list of configured restriction, enter the
ntpvres
command at the system
prompt. A screen similar to the following appears:
address
mask
count
flags
==============================================================
0.0.0.0
0.0.0.0
12
none
127.0.0.1
255.255.255.255
0
ntpport, ignore
Field Descriptions
The following section describes the fields displayed with the
ntpvres
command.
address
. The
IP
address of the
NTP
entity for which flags have been configured.
mask
. The subnet mask of the
NTP
entity for which flags have been configured.
count
. The number of
NTP
messages from the
NTP
entity that have been affected by the
configured flags.
flags
. The flags configured for this
NTP
entity. For a description of all possible flags, see