This modification to the netstat plugin /usr/local/share/munin/plugins/netstat makes it show the currently established TCP connections (as this module does on linux). 99c99 < /connections established/ { print "established.value " $1 }' --- > /in ESTABLISHED state/ { print "established.value " $1 }'
This does not work on FreeBSD 10.4, there is no line with "in ESTABLISHED state" in it.