[url=http://www.isaserver.org/tutorials/Configuring_ISA_Server_for_Incoming_Ping_Responses__By_Dieter_Rauscher.html]Configuring ISA Server for Incoming Ping Responses[/url]
[url=http://support.microsoft.com/kb/838251]How to enable ICMP traffic from protected SecureNet clients to external hosts in ISA Server 2006 and ISA Server 2004[/url]