... to 200 concurrent tunnels. IPSec provides features of auto key (IKE) and manual key, ESP/AH protocols, DES/3DES/AES encryption ... Supported:IP, TCP, ARP, UDP, ICMP, NAT, reverse NAT, HTTP, IKE, ISAKMP, ESP, AH, MD5, SHA-1, DES, 3DES, AES, L2TP ...