Working Properly…

My commands.cfg file

define command{
command_name check_bandwidth
command_line $USER1$/check_iftraffic.pl -H $HOSTADDRESS$ -C $ARG1$ -r -i $ARG2$ -b 1000 -u g
}
###############################
My server.cfg file

define service{
use generic-service,srv-pnp
host_name linux_pc1
service_description Bandwidth Utilization
check_command check_bandwidth!public!eth0
normal_check_interval 1
retry_check_interval 1
}