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DI-206 ISDN Remote Router
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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
hub.
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-206 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 in the IP Static Routes, the DI-206 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.