User manual SIEMENS GIGASET SE505

[. . . ] s Be inspired Contents Contents Safety precautions . 6 Procedure for installation and configuration . 11 Setting up the Gigaset SE505 dsl/cable . 13 Installing the Gigaset SE505 dsl/cable . [. . . ] However the router's Firewall function does not normally allow PC's in the LAN to be accessed from "outside". To make services that are provided by local PC's available on the Internet therefore, you should N either put the PC on which the server application is running in a so-called demilitarised zone (DMZ) (see page 87) or N set up the router as a virtual server. In this case, Port Forwarding will forward requests for the service which the router receives from the Internet to the PC that provides the service (see page 88). If your router gets a Dynamic IP address from your ISP, you must make sure that the service is always available despite the router's changing IP address. You can use the router's DynDNS function for this (see page 89). i You will find a detailed example of how to set up URL blocks in "Practical Tips and Configuration Examples" on the CD supplied. 82 Configuration with Advanced Setup Opening the firewall for selected PC's (DMZ) PC's inside the LAN cannot be accessed from the Internet by default. The router protects the LAN by its Firewall. Some applications do not work properly behind a firewall because they require unrestricted data flow in both directions. In this case you can define a so-called demilitarised zone (DMZ) for a PC running such applications. When you create a DMZ, all requests for a service that come from the Internet will be forwarded to that PC unless the service has already been forwarded to another PC by Port Forwarding (see page 88). Please bear in mind that the demilitarised PC is no longer protected against unauthorised access from the Internet and as such could be a security risk for your network. You should use this option only in emergency situations. ! N To create a DMZ for a PC, select DMZ in the Virtual server menu. i You will find an example of how to create a DMZ in "Practical Tips and Configuration Examples" on the CD supplied. 83 Configuration with Advanced Setup Port Forwarding Port Forwarding (the forwarding of requests to particular ports) is needed when you wish to operate Server services for the Internet on a PC in your LAN. For example, on one of your PC's you could run a Web server which provides HTML pages. In this case the router acts as the Virtual server, forwarding requests for an HTML page from the Internet to the designated PC on which the Web server is running. Externally the router takes on the role of the server. It receives requests from remote users under its public IP address and automatically redirects them to local PC's. The private IP addresses of the servers on the local network remain protected. Internet services are addressed by defined Ports. The router needs a mapping table of the port numbers to redirect the service requests to the server that actually provides the service. N To set up Port Forwarding for a service, select Port Forwarding in the Virtual server menu. i You will find an example of Port Forwarding in "Practical Tips and Configuration Examples" on the CD supplied. 84 Configuration with Advanced Setup Activating dynamic DNS A service which you wish to provide on the Internet can be accessed by a Domain name. Your router's Public IP address is assigned to this Domain name. If your Internet Service Provider assigns the IP address for your local network's WAN connection dynamically, then the IP address of the router may change. The assignment to the Domain name will no longer be valid and your service will no longer be available. [. . . ] 84 Internet Protocol see IP address Internet Service Provider . 9, 15 135 Index ipconfig / release . 128 ISP see Internet Service Provider O Obtain an IP address automatically Windows 2000 . 16 Layer Two Tunneling Protocol see L2TP LED displays . [. . . ]