... . IPSec provides features of auto key (IKE) and manual key, ESP/AH protocols, DES/3DES/AES encryption algorithm, MD5/SHA-1 ... -routing, reverse NAT and NAT ALG: FTP, PPTP and IPSec ESP, etc. Key Features 1. Support connection via DSL, FTTx+LAN ... , TCP, ARP, UDP, ICMP, NAT, reverse NAT, HTTP, IKE, ISAKMP, ESP, AH, MD5, SHA-1, DES, 3DES, AES, L2TP, PPTP, IPSec ...