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Here is a table of the config variable and what it controls, these are all set in Config.nmis where you can find the default values:

Configuration VariableDefault (if not set at all)Controls



Controls the -t setting for fping which is:

-tn  Initial target timeout in milliseconds (default 500). In the default mode, this is the amount of time that fping waits for a response to its first request.  Successive timeouts are multiplied by the backoff factor.


Controls the -b setting for fping which is:

-bn  Number of bytes of ping data to send.  The minimum size (normally 12) allows room for the data that fping needs to  do its work (sequence number, timestamp).  The reported received data size includes the IP header (normally 20 bytes) and ICMP header (8 bytes), so the minimum total size is 40 bytes.  Default is 56, as in ping.  Maximum is the  theoretical maximum IP datagram size (64K), though most systems limit this to a smaller, system-dependent number.

If this is set to < 24 it will be set to 24.


Controls the -r setting for fping which is:

 -rn  Retry limit (default 3). This is the number of times an attempt at pinging a target will be made,  not  including  the first try.

fastping_count 3

Controls the -C setting for fping which is:

 -C   Similar to -c, but the per-target statistics are displayed in a format designed for automated response-time statistics gathering.  For example:

            % fping -C 5 -q somehost

            somehost : 91.7 37.0 29.2 - 36.8

            shows the response time in milliseconds for each of the five requests, with the "-" indicating that  no  response  was received to the fourth request.

fastping_sleep60The number of seconds fpingd will sleep before running another ping cycle + random(10)
fastping_node_poll200The number of nodes to ping in one invocation of fping. We strongly recommend that this value is set to no more than 250; otherwise you risk exceeding the linux command line length limits which will cause incorrect operation of



The interval between sending ping packets.

Some firewalls like to have larger gaps between packets, setting fastping_interval to 80 and fastping_target_interval to 100 could be used to pacify these devices.


The interval between ping packets to one target.

See fastping_interval.