Chapter 1. Understanding ISDN and the Express 4100/4110
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figuration/IP/NAT menu that allows incoming HTTP, FTP, and mail
server requests from the Internet to be translated and forwarded to this
address on the user network.
Configuration
The Express 4100/4110 is configured using a menu-based interface. This
interface can be accessed via the maintenance port using any asynchro-
nous VT 100 terminal or personal computer running a terminal emulation
program, or via the LAN using a Telnet client program. To use the Telnet
interface, the Express 4100/4110 must first have an IP address pro-
grammed into it via the maintenance port. The factory default is 10.0.0.1.
Security
Security on network devices is a major concern for almost anyone with a
network. The Express 4100/4110 provides many tools for securing the
local network from hostile users. Incoming calls can be authenticated
using passwords and Caller ID. A RADIUS client can also be used.
The Telnet configuration can also be protected using the same authentica-
tion methods. Each menu item in the Express 4100/4110 has a security
level associated with it. A Telnet session is assigned a privilege level
which determines which menu items are accessible to the Telnet client.
See “Security Levels” on page 3-7 (in Chapter 3) for more information on
menu security levels.
Filters can be defined to prevent certain addresses or protocols from being
transferred from LAN-to-WAN, WAN-to-LAN, or WAN-to-WAN.
