Dial-Out Network Connections - D-Link DI-308 User Manual

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.
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DI-308 ISDN Remote Router