... auto key (IKE) and manual key, ESP/AH protocols, DES/3DES/AES encryption algorithm, MD5/SHA-1 hash algorithm, main mode and ... NAT, HTTP, IKE, ISAKMP, ESP, AH, MD5, SHA-1, DES, 3DES, AES, L2TP, PPTP, IPSec over L2TP/PPTP, PPTP/L2TP over IPSec ...