Nagios Support Forum

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[root@monitoring-nagiosxi ~]# /usr/local/nagios/libexec/check_udp -H 10.100.1.16 -p 161 -s "string" -e "expected string"
CRITICAL - Socket timeout
[root@monitoring-nagiosxi ~]# /usr/local/nagios/libexec/check_udp -H 10.100.1.16 -p 161 -s "snmp" -e "snmp"
CRITICAL - Socket timeout

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'
     -s, --send=STRING
        String to send to the server // ?? from where or how to find this
     -e, --expect=STRING
        String to expect in server response (may be repeated)  // ?? from where or how to find this

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[root@monitoring-nagiosxi ~]# ./check_udp_port -H 10.100.1.16 -p 161 -s snmp
OK: snmp listening on port 161: 161/udp open snmp
[root@monitoring-nagiosxi ~]# echo $?
0
[root@monitoring-nagiosxi ~]# ./check_udp_port -H 10.100.1.26 -p 161 -s snmp
CRITICAL:
[root@monitoring-nagiosxi ~]# echo $?
2
[root@monitoring-nagiosxi ~]# ./check_udp_port -H 10.100.1.16 -p 161 -s snmp1
WARNING: Incorrect service snmp listening on port 161: 161/udp open snmp
[root@monitoring-nagiosxi ~]# echo $?
1

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check_udp_port[/icode] will do the job just fine

If you need to send a specific string to the port and get an expected result, then [icode]check_udp[/icode] would work, however, you need to know what string to send to the UDP port and what you expect to get back.

[quote="progressive.nagiosXI"]we checked with check_udp_port its working fine but no parameter found for graph generation,Device response time value for graph etc .[/quote]

When you are just monitoring if the port is listening or not, there isn't much to graph and this plugin doesn't return graphing data.  Especially because of the way UDP operates, it isn't returning any sort of response time.

If you needed to graph some metric, you would need to modify the plugin to return whatever data you needed to be graphed in the performace data format
[url]https://nagios-plugins.org/doc/guidelines.html#AEN200[/url]