Network Interface Checks
These checks are for the network interface cards (NIC) on the remote computer. Depending on your Operating System (OS) the NIC will be named differently, here are some examples:
Nagios Plugins does not provide NIC checking capabilities.
NPCA includes an interfaces module. There are several check types available depending on what you want to monitor. The interface metrics are an increasing number, hence the delta -d argument is used to get the change in value (in seconds) over time since the last check result, producing useful performance graph data.
Bytes Sent / Bytes Received
| Unit: | k |
| Warning: | 10kB/s |
| Critical: | 100kB/s |
Commands:
./check_ncpa.py -H 10.25.14.10 -t 'Str0ngT0k3n' -P 5693 -M 'interface/Ethernet0/bytes_sent' -d -u k -w 10 -c 100
./check_ncpa.py -H 10.25.14.10 -t 'Str0ngT0k3n' -P 5693 -M 'interface/Ethernet0/bytes_recv' -d -u k -w 10 -c 100
Output:
OK: Bytes_sent was 0.26 kB/s | 'bytes_sent'=0.26;10;100; OK: Bytes_recv was 1.46 kB/s | 'bytes_recv'=1.46;10;100;
The following nodes are also available:
NSClient++ via check_nt does not include a NIC module.
An alternative method is to query a performance counter, for example:
\Network Interface(Intel[R] PRO_1000 MT Network Connection)\Bytes Received/Sec
More information about performance counters can be found in the Performance Counter Checks KB article.
NSClient++ via check_nrpe includes a check_network module however it doesn't seem to report any data, it's likely this module is still in a development stage (tested with 0.5.2.20). An example command has been provided:
Command:
./check_nrpe -H 10.25.14.2 -c check_network
Output:
: Intel(R) PRO/1000 MT Network Connection >0 <0 bps|'Intel(R) PRO/1000 MT Network Connection_total'=0;10000;100000
An alternative method is to query a performance counter, for example:
\Network Interface(Intel[R] PRO_1000 MT Network Connection)\Bytes Received/Sec
More information about performance counters can be found in the Performance Counter Checks KB article.
Check WMI Plus includes a checknetwork module and produces a lot of output.
Bytes Sent / Bytes Received
| Unit: | Bytes |
| Warning: | 10000B/s |
| Critical: | 100000B/s |
Commands:
./check_wmi_plus.pl -H 10.25.14.10 -u wmiagent -p Str0ngP@ssw0rd -m checknetwork -a 'Ethernet0' -w _BytesSentPersec=10000 -w _BytesReceivedPersec=10000 -c _BytesSentPersec=100000 -c _BytesReceivedPersec=100000
Output:
OK (Sample Period 262 sec) - Number of Interfaces=1. Interface Details - OK - Interface:Ethernet0, IP Address:(10.25.14.10,fe80::88ae:6647:7d3c:da4c,2001:44b8:3132:25:10cc:fe71:bc9b:1b3e,2001:44b8:3132:25:88ae:6647:7d3c:da4c,
2001:44b8:3132:25:10:25:254:f440,2001:44b8:3132:25:10:25:14:10), MAC Address 00:50:56:AB:AD:9D, Speed:1Gbit/s, DHCPEnabled=False, Byte Send Rate=295B/sec (Utilisation=0.00%), Byte Receive Rate=1.718KB/sec(Utilisation=0.00%)
Packet Send Rate=1packet/sec, Packet Receive Rate=9packet/sec, Output Queue Length=0, Packets Received Errors=0 |'Ethernet0 BytesSentPersec'=295;10000;100000; 'Ethernet0 Send Utilisation'=0.00%;
'Ethernet0 BytesReceivedPersec'=1718;10000;100000; 'Ethernet0 Receive Utilisation'=0.00%; 'Ethernet0 PacketsSentPersec'=1; 'Ethernet0 PacketsReceivedPersec'=9; 'Ethernet0 OutputQueueLength'=0; 'Ethernet0 PacketsReceivedErrors'=0;
If your Windows OS is older than Server 2012 or Windows 8 then you may require the -o legacy argument.
The following thresholds are also available:
Monitoring NICs using SNMP can be done using MRTG. It is a powerful program and you should refer to the official website on how to get it up and running:
If you are using Nagios XI then you simply run the Network Switch / Router configuration wizard. This uses MRTG in the backend and the wizard does all the configuring for you. Even though the name of the wizard says switch / router it can be used against any OS that has SNMP enabled.
For any support related questions please visit the Nagios Support Forums at:
http://support.nagios.com/forum/
Article ID: 781
Created On: Mon, Nov 20, 2017 at 8:47 PM
Last Updated On: Mon, Nov 20, 2017 at 8:47 PM
Authored by: tlea
Online URL: https://support.nagios.com/kb/article/network-interface-checks-781.html