Handy iptables scripts
Allow pings:
iptables -I OUTPUT --protocol icmp --jump ACCEPT iptables -I INPUT --protocol icmp --jump ACCEPT
Testing a clients machine that it can connect to the CC VPN at Crows Nest:
(This should be AFTER any the allow pings lines in scripts, due to being an INSERT type rule.)
iptables -I OUTPUT --protocol icmp -o eth0 --destination 192.168.240.1 --jump DROP