... ,IPSEC and GRE)(only for VPN version),DHCP server and client,DDNS (dynamic DNS),firewall,NAT and ... CStorage temperature: -40~+85ºCHumidity: 95% (unfreezing)Software functionSupport VPN client(PPTP,L2TP,IPSEC and GRE)(only for ... specifying local and remote IPCan be used as PPP server. Support multi authentication method, such as PAP,CHAP, ... firmwareSupport multi OS, such as WINDOWS, LINUX, SCO UNIX etc