XP firewall doesn't understand GRE (IP protocol 50) AH (IP Protocol 51) See Note 2 ESP plus AH See Note 1 ESP (IP protocol 50) whatis techtarget com/ateQuestionNResponse/0,289625,sid33_cid494795_tax288040,00 html More pages from technet microsoft com/en us/library/f9733398 a21e 4b40 8601 cfb452da82ad aspx More pages from informit com Internet Protocol Security: Frequently Asked Questions asked questions about Internet Protocol security (IPsec) support in the IP Network Address Translator (NAT) en wikipedia org IP (Internet Protocol) from Tom Sheldon's Encyclopedia of Busy Ethernet networks may exhibit performance problems with as few as 50 hosts www linktionary com/i/ip html More pages from linktionary com © Prof Amir HerzbergFile type:PDF Download PDF Reader(IP protocol 50): supports encryption and/or authentication (MAC) AH: Change protocol field to AH (51) or ESP (50) Otherwise, use existing IP header as possible, as well as ISAKMPthat is, UDP port 500 and IP protocol 50 and UDP Port 500 www windowsitpro com/Article/ArticleID/15309/15309 html More pages from linux com Using IPsec with ExchangeLearn how to use IPSec to secure communications between your front end and back communication, open IP protocol number 50 (ESP) protocol, IP protocol 50 from IP B B B only www securityfocus com/archive/105/359266 More pages from windowsitpro com SecurityFocusSecurityFocus is designed to facilitate discussion on computer location A we allow only UDP port 500 traffic and IP protocol number 50 (ESP) protocol, IP protocol 50 called the Encapsulating Security Payload (ESP) 500/UDP Internet technet microsoft com/en us/library/f9733398 a21e 4b40 8601 cfb452da82ad aspx More pages from support microsoft com Linux com Linux VPN Masquerade HOWTO: Background Knowledge the traffic between the client and server use IP protocol 50, encrypts the entire contents of the IP header www cs biu ac il