To monitor network traffic on your systems using nagios there is the check_netio plugin on nagios exchange.

Here's the setup for debian systems:

• Download the check_netio_1.1 to /usr/local/bin and test it. You will have to change paths, like this: check_netio_1.1_debian Copy this file to all your servers that you check by ssh.
• Add a new command definition to your nagios setup:

# 'ssh_netio' command definition                                                          
define command{                                                                           
        command_name ssh_netio                                                            
        command_line /usr/lib/nagios/plugins/check_by_ssh -H $HOSTADDRESS$ -C "/usr/local/bin/check_netio_1.1 -i $ARG1$"                                                            
}                                                                                         
  

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