ELSA LANCOM Business LC-4X00, Manual

Page: 123 / 276

Workshop
ELSA LANCOM Business
113
The route to the IP address '255.255.255.255' with the netmask '0.0.0.0' intercepts
all packets which cannot be assigned locally. 'Router' identifies the remote station
to which the relevant data is to be sent. The remote station can be accessed directly
from your router in the Example Inc. so the distance is set at '2'. Setting the option
for IP masquerading to 'ON' hides all the computers in the LAN behind the router's
address so that they will not appear on the Internet.
햹
The router at the ISP must have the same entry in the routing table. This route
contains the registered IP address of the router in the Example Inc. and the name of
the remote station. 'IP masquerading' remains disabled for this route since the
direction must be routed and not be masked.
cd /Setup/IP-router-module
set IP-routing-table 194.168.166.123 255.255.255.255
Example 2 Off
The 'Proxy-ARP' function must be enabled since this IP address falls within the
service provider's own address range:
cd /Setup/IP-router-module
set Proxy-ARP ON
햺
The web server is made visible on the Internet by an entry in the service list for the
Example Inc.'s device (configuration area 'TCP/IP', 'Masq.' tab):
cd /Setup/IP-router-module/Masquerading/Service-table
set 80 10.100.100.99
Specifying '80' as the value indicates that the service visible to the outside is HTTP
(WWW) and the address '10.100.100.99' selects the computer with this special
Intranet address as the web server.
You will find a list containing further services in the section headed 'TCP/IP Ports'.
햻
Now activate the IP router only (configuration area 'TCP/IP', 'Routing' tab), and the
router is ready for the WWW.
cd /Setup/IP-router-module
set operating on
햽
What's left to do? Obviously the computers in the LAN will also need to know that
the router is the gateway to the Internet. This will require the router's Intranet
address being specified as the default gateway on the workstation computers. The
IP address of the relevant server at the ISP is also identified as the DNS server.