Dear Romain.Le.Guen@xxxxxxxxxxx, Neither ISA Server 2004 nor Windows 2003 Basic Firewall support IPv6 filtering, IPX filtering, etc. This is different network protocol. --Monday, April 3, 2006, 7:08:55 PM, you wrote to bugtraq@xxxxxxxxxxxxxxxxx: RLGrc> When IPv6 is active on an interface of an ISA Server 2004, it seems that IPv6 packets are not filtered and bypass the firewall. -- ~/ZARAZA http://www.security.nnov.ru/