Lancom 800+ User Manual

Also see for 800+: Installation guide

Contents

Lancom 800+ User Manual Manual pdf 16 page image

LANCOM 800+ – LANCOM DSL/I- 10+ – LANCOM DSL/I- 1611 Office Chapter 1: Introduction16ENConnecting a LAN to the Internet does not technically differ from coupling twoLANs. The only difference is that it is not just a handful of computers behindthe Internet provider's router. Instead, it is the net of the networks - the publicInternet.1.4.1 Bridgehead to the WANAll routers have at least two connections: at least one for the LAN at least one for WAN connectionsIn addition to LAN connectivity (10/100 Mbps Ethernet), several models alsooffer an integrated switch. For the connecting to the WAN, the routers useISDN, xDSL/cable or ADSL connectors. Several devices contain additionally awireless network card and can thus integrate also stations of WLANs (WirelessLANs) into the routing.The router's task is to transfer data from the local network to the target net-work via a suitable WAN connection. Data is also transferred from the WANto the desired recipients in the LAN.1.4.2 Areas of deployment for routersRouters are mainly used for the following applications: Internet access for a LAN (e.g. via DSL or ISDN)The Internet consists of countless large and small networks that are inter-connected into the world's largest WAN via routers. The router links all theworkstation computers on your local area network to the global Internet.Security functions such as IP masquerading protect your LAN againstunauthorized access from outside. LAN to LAN coupling (via VPN or ISDN)LAN to LAN coupling links individual LANs to form one large network,even if this means crossing continents. A typical example: A branch officeis to be connected to the LAN of the headquarters. In principle, you canconnect LANs in two ways:Not possible withall LANCOMdevices. High-speed coupling via VPNThe fastest and most economical LAN to LAN links are possible withVPN (Virtual Private Network) technology, as VPN uses the Internet asthe basis for its communications. The fast xDSL connection of therouter comes into its own here. The precondition: a VPN gateway with