Ok Karl… Null routing – real easy 🙂
If you wanted to null route a single IP (192.168.0.1), you would run (as root):
/sbin/route add 192.168.0.1 127.0.0.1 -blackhole
If you wanted to null route a block of IPs (192.168.0.0/24), then use:
/sbin/route add -net 192.168.0.0/24 127.0.0.1 -blackhole
If you would rather generate a “Destination Host Unreachable” ICMP response instead of blackholing the traffic, replace -blackhole with -reject
Ok Karl, here you go… Once you have installed RTG on your server from FreeBSD ports and configured it, you can add this script to your /usr/local/etc/rc.d/ folder. Make sure it runs AFTER your mysql server starts or it will be useless!
#!/bin/sh
case “$1” in
‘start’)
rm /tmp/rtgpoll.pid
/usr/local/bin/rtgpoll -c /usr/local/etc/rtg/rtg.conf -t /usr/local/etc/rtg/targets.cfg &
;;
‘stop’)
;;
*)
echo “Please specify ‘start’ or ‘stop'”
;;
esac