If you have enabled 'Packet Filtering' the default packet filters that are installed with ISA are design to give you the result you mention ..."ping our website (ping www.domain.com) in that moment I get a response from an unknown IP address." -----Original Message----- From: Carlos Mauricio Perez Cortes [mailto:mauriciop@xxxxxxxxxxxx] Sent: Friday, August 10, 2001 12:32 PM To: [ISAserver.org Discussion List] Cc: Sistemas Subject: Urgent Help!!! IP spoofing attacks Importance: High http://www.ISAserver.org This is a multi-part message in MIME format.