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22.16.2. Configure Rate Limiting Access to an NTP Service
To enable rate limiting access to the
NTP
service running on a system, add the limited
option to the restrict
command as explained in Section 22.16.1, “Configure Access Control to an NTP Service”. If you do not want to use the default discard parameters, then also use the discard
command as explained here.
The
discard
command takes the following form:
discard
[average
value] [minimum
value] [monitor
value]
average
— specifies the minimum average packet spacing to be permitted, it accepts an argument in log2 seconds. The default value is 3 (23 equates to 8 seconds).minimum
— specifies the minimum packet spacing to be permitted, it accepts an argument in log2 seconds. The default value is 1 (21 equates to 2 seconds).monitor
— specifies the discard probability for packets once the permitted rate limits have been exceeded. The default value is 3000 seconds. This option is intended for servers that receive 1000 or more requests per second.
Examples of the
discard
command are as follows: discard average 4
discard average 4 minimum 2