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The IP address for the Single User Account can be either fixed or
dynamically assigned by the ISP (or other remote node). In
addition, you can also configure a server, e.g., a Web server, on
your local network and make it accessible by outside users.
If you do not set a server IP address, SUA offers the additional
benefit of firewall protection. This is because if no server is defined,
all incoming inquiries will be filtered out by the router even if you
do have a server on your network. This can prevent intruders from
probing your system.
The router accomplishes this address sharing by translating the
internal LAN IP addresses to a single address that is globally
unique on the Internet. For more information on IP address
translation, refer to RFC 1631, The IP Network Address Translator
(NAT).
In summary:
1. SUA is an ideal, cost-effective solution for small offices with
less than 20 hosts using a LAN to concurrently access the
Internet or other remote TCP/IP network.
2. SUA can provide one server address to be accessed by Remote
Dial-in Users, thus controlling the incoming packets.
3. SUA can provide firewall protection if you do not configure a
server IP address. All incoming inquiries will be filtered out by
the DI-106 or DI-106M. Therefore, servers on your network are
protected.
4. UDP and TCP datagrams can be routed. In addition, ICMP echo
can also be routed.
Configuring for Internet Access
53
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