Mode Transport Tunnel
GRE (usually not needed for transport mode)
GRE Tunnel Key (If GRE Tunnel key is used)
NAT-T (If NAT Transerval is used)
ESP noneAES-128AES-192AES-256ESP-DESESP-3DESESP-nullnoneesp-aes-xcbc-macesp-md5-hmacesp-sha-hmac
AH noneah-xcbc-macah-md5-hmacah-sha-hmac