High end firewalls will monitor ICMP and can restrict the size of the payload. They'd probably also notice the large number of ICMP packets. Big corporate plac

High end firewalls will monitor ICMP and can restrict the size of the payload. They'd probably also notice the large number of ICMP packets. Big corporate places can completely restrict things and prevent any traffic from internal hosts to the internet. You can use proxying for web browsing etc. and then monitor that to check for any unauthorised traffic.