NCP Seremo Client for communication with any IPsec gateway (compatibility list at http://www.ncp.de). It supports all transmission networks like ISDN, PSTN, DSL, Internet, GSM, GPRS, UMTS, LAN, WLAN, and it runs on all Windows operating systems. Firewall features: IP-NAT, defined filter rules. Authentication relative to the destination gateway can be executed via OTP tokens. All data are encrypted for transmission. Support for: Triple DES 128, 192-bit, Blowfish 128-bit, AES 128, 192, 256-bit. The Seremo Client can also be implemented in IT environments without permanent IP addresses. DynDNS (Dynamic DNS) is used to dial-in to the central RPV gateway with changing public IP addresses which are queried via a public DynDNS server (prerequisite: the destination gateway must support DynDNS).