Hi Hicham, IPSec tunnel mode is different than the UDP or even TCP encapsulation you do for NAT traversal. IPSec tunnel mode is used primarily in gateway to gateway VPN network communications, not client server. HTH, Tom Thomas W Shinder www.isaserver.org/shinder ISA 2004 Beta - Get it now! http://www.microsoft.com/isaserver/beta/default.asp ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: HICHAM BARDAWIL [mailto:bardawilh@xxxxxxxxxxx] Sent: Tuesday, February 10, 2004 1:29 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: fast question http://www.ISAserver.org hey guys does anybody kno the difference (if exists) between ipsec encapsulation and tunneling ? i found out the tunnel mode uses encapsulation but my boss keeps insisting that there is a difference ?!? _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: tshinder@xxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')