(c) Matsushita Electric Works, Ltd. http://www.netcocoon.com/ � PKI �IPsec/SSL �IETF � (http://www.netcocoon.com) 2004.12.9 (c) Matsushita Electric Works, Ltd. http://www.netcocoon.com/ IPsec � ESP,AH,IPComp � DOI:SA � IKE SA � ISAKMP IKE Oakley SKEME IKE ESP AH DOI ISAKMP IPComp (c) Matsushita Electric Works, Ltd. http://www.netcocoon.com/ IPsec IPv4 + TCP IPv4 + IPv4 + IPv4 + ESP TCP TCP AH TCP