Dns Proxy; Security; Calling Line Identification; Pap And Chap Authentication - NETGEAR RT338 Reference Manual

Reference Guide for the Model RT338 ISDN Router

DNS Proxy

When DHCP is enabled and no DNS addresses are specified, the router provides its own address
as a DNS server to the attached PCs. The router obtains actual DNS addresses from the ISP during
connection setup and forwards DNS requests from the LAN.

Security

The Model RT338 router is equipped with several features designed to maintain security, as
described in this section.

Calling Line Identification

The use of Calling Line Identification (CLID or Caller ID) ensures that incoming ISDN calling
numbers are checked against known numbers before a call is answered and access is granted,
thus providing a first level of security. In many areas, you must specifically request that CLID
be enabled by the telephone company for your ISDN line. In some regions, CLID may not be
available. In the Model RT338 router, the CLID information is transmitted on the analog phone
ports.

PAP and CHAP Authentication

For connecting to other routers, the Model RT338 router supports two authentication protocols:
Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol
(CHAP). PAP sends the user name and password in plain text. CHAP scrambles the password
before it is sent over the wire.

Callback

For security and simplified cost accounting, the router implements Callback. When a remote user
dials in, the router can disconnect the call and call the user back, so that any further call charges are
incurred by the location of the router. The caller can provide the callback numbers; or, for security,
the router can be programmed to call back a predetermined number.
Introduction 1-5