D-Link manual When a packet on the LAN reaches the router, the DI-308 will

DI-308 ISDN Remote Router

3.Assuming a matching Remote Network Profile is found, the router may configure the IP address of the remote station (as defined in the Remote Network Profile).

4.Configures the specified ISDN Interface (a virtual circuit) using the configuration parameters defined in the Interface Configuration menu and the Remote Network Profile to handle the connection.

5.Establishes the connection on whichever B-channel (physical port) is open by mapping the dial-in interface to that port.

Dial-Out Network Connections

Dial-out network connections are much different than dial-in connections.

When a packet on the LAN reaches the router, the DI-308 will:

1.Check its routing table to try to identify where this packet should go. It looks for two variables in the routing table, Gateway address and Interface. There are four possible results:

I.In the case where the destination resides in the same IP network on the LAN, the routing engine never acts on the packet and it is sent directly to the destination through the built-in switch.

II.In the case where the destination resides on a different IP network on the LAN (which can happen when Multiple Home Configuration is set up), the router will send out an ARP request to obtain the MAC address of the destination computer (or router) and deliver the packet. Note that defining Static ARPs can speed up delivery since the router won’t need to send out an

ARP request.

III.In the case where the router finds a match in the routing table (which includes IP Static Routes), it uses the Gateway address and Interface numbers to identify the correct Remote Network Profile to use to dial out. From the Remote Network Profile, the router gets the telephone number and other information and dials out, establishes a connection and delivers the packet. If you have a connection to the Internet, it is very important that you define the default next hop router in the IP Static Routes submenu of the console program as your ISP (see the IP Static Routes section of this manual for more detailed configuration information). This is because if a user on your LAN makes a request to download a web page for the first time, for instance, since it is the first time, the DI-308 will not have any record of the web page’s IP address. If no default next hop router is defined, the request will be dropped and the user will get a ‘Destination Unreachable’ error message. However, if a default next hop router is defined on the IP Static Routes screen, the DI-308 will pass this request on to the ISP (the request will go through) and the user will receive the web page.

IV. In the case where there is no match for the destination IP address in the routing table, and no default next hop router is defined, the packet will be dropped and no action will be taken.

The Remote Access Configuration submenu is shown below. All items in the submenu are described as follows.

33