Because AH authenticates the entire IP Packet including the header thus NAT breaks AH.
Regards, Tyson Scott - CCIE #13513 R&S, Security, and SP Managing Partner / Sr. Instructor - IPexpert, Inc. Mailto: [email protected] Telephone: +1.810.326.1444, ext. 208 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com <http://www.ipexpert.com/> From: [email protected] [mailto:[email protected]] On Behalf Of Vybhav Ramachandran Sent: Tuesday, September 14, 2010 7:12 AM To: Kingsley Charles; OSL Security Subject: Re: [OSL | CCIE_Security] NAT-T only for ESP Hello Kings, Yes, i believe AH will fail when there's any sorta nat in between the spokes. I think that's cause ( as you have already stated ) , the headers are also authenticated. Cheers, TacACK
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