Description:

The NSCA addon is designed to accept passive host and service check
results from clients that use the send_nsca utility (included in
client subpackage) and pass them along to the Nagios process by using
the external command interface. The NSCA daemon can either be run as a
standalone daemon or as a service under inetd. If you have libmcrypt
installed on your systems, you can choose from multiple crypto
algorithms (DES, 3DES, CAST, xTEA, Twofish, LOKI97, RJINDAEL, SERPENT,
GOST, SAFER/SAFER+, etc.) for encrypting the traffic between the
client and the server. Encryption is important in this addon, as it
prevents unauthorized users from sending bogus check results to
Nagios.