# comments are prefixed with # interface eth0 provider ISP-1 pinghost 10.2.0.3 up-action /etc/pingu/isp1 up down-action /etc/pingu/isp1 down interface eth1 provider ISP-2 pinghost 192.168.0.1 up-action echo "isp 2 went up" >> /var/log/isp2.log down-action echo "iso 2 went down" >> /var/log/isp2.log