Munin contributed plugins

#!/bin/sh

#

# Plugin to monitor ARP entries per interface

#

# Parameters understood:

#

#       config   (required)

#       autoconf (optional)

#

#  Made by Sven Hartge (sven AT svenhartge DOT de)

#  change to iproute by Martin89 (martin AT martin89 DOT de)

#

#

#%# family=contrib

#%# capabilities=autoconf suggest

case "$1" in

	autoconf)

		# Search for ip

		which ip >/dev/null 2>&1

		if [ $? -ne 0 ]; then

			echo "no (can't find ip binary)"

			exit 1

		fi

		# ...or success

		echo 'yes'

		exit 0

	;;

	suggest)

		if [ ! -r /proc/net/dev ]; then

			exit 1

		fi

		awk '$1~ /^(eth|wlan|ath|ra)[0-9]+(\.[0-9]+)?/ { gsub(":", ""); gsub("\.", "_"); print $1 }' /proc/net/dev

		exit 0

	;;

	config)

		INTERFACE="$(basename $0 | sed 's/^arp_//g' | tr '_' '.')"

		if [ -z "$INTERFACE" ]; then

			exit 1

		fi

		echo "graph_title ARP/NDP entries for $INTERFACE"

		cat <<'EOM'

graph_args --base 1000 -l 0

graph_vlabel Entries

graph_category network

graph_scale no

graph_info This graph shows the number of ARP and NDP entries for a interface.

entries4.label ARP entries

entries4.info Number of ARP entries

entries6global.label NDP global entries

entries6global.info Number of NDP entries for global IPv6 address

entries6local.label NDP local entries

entries6local.info Number of NDP entries for link-local IPv6 address (fe80::/64)

EOM

		exit 0

	;;

esac

INTERFACE="$(basename $0 | sed 's/^arp_//g' | tr '_' '.')"

if [ -z "$INTERFACE" ]; then

	exit 1

fi

ip neigh show dev "$INTERFACE" | awk 'BEGIN { a=0; b=0; c=0 }

/(REACHABLE|DELAY|STALE)/ { if ($1~ /^fe80:/){c++} else{if ($1~ /^[0-9]+\./) {a++} else{b++} } }

END { print "entries4.value", a "\nentries6global.value", b, "\nentries6local.value", c }'