38 Chapter 1 Getting to know your Nortel Business Secure Router 222NN47922-500PPTP EncapsulationPoint-to-Point Tunneling Protocol (PPTP) is a network protocol that enablessecure transfer of data from a remote client to a private server, creating a VirtualPrivate Network (VPN) using a TCP/IP-based network.PPTP supports on-demand, multiprotocol, and virtual private networking overpublic networks, such as the Internet. The Business Secure Router supports onePPTP server connection at any given time.Dynamic DNS supportWith Dynamic DNS (Domain Name System) support, you can have a static hostname alias for a dynamic IP address, so the host is more easily accessible fromvarious locations on the Internet. You must register for this service with aDynamic DNS service provider.IP MulticastThe Business Secure Router can use IP multicast to deliver IP packets to a specificgroup of hosts. IGMP (Internet Group Management Protocol) is the protocol usedto support multicast groups. The Business Secure Router supports versions 1 and2.IP AliasUsing IP Alias, you can partition a physical network into logical networks overthe same Ethernet interface. The Business Secure Router supports three logicalLAN interfaces via its single physical Ethernet LAN interface with the BusinessSecure Router itself as the gateway for each LAN network.Central Network ManagementWith Central Network Management (CNM), an enterprise or service providernetwork administrator can manage your Business Secure Router. The enterpriseor service provider network administrator can configure your Business SecureRouter, perform firmware upgrades, and do troubleshooting for you.
