Tcp/Ip Support; Ip Address Masquerading By Dynamic Nat; Automatic Configuration Of Attached Pcs By Dhcp; Security - NETGEAR RH348 Reference Manual

Reference Guide for the Model RT328 and Model RH348 ISDN Routers

TCP/IP Support

The Model RT328/RH348 router supports the Transmission Control Protocol/Internet Protocol
(TCP/IP) and Routing Information Protocol (RIP), which ensures that ISDN connections are
established only when passing data.
For further information about TCP/IP, refer to "Basic Router Concepts" on page 1-6.

IP Address Masquerading by Dynamic NAT+

Both NETGEAR routers allow an entire department of networked PCs to share an Internet account
using only a single IP address, which may be statically or dynamically assigned by your Internet
service provider (ISP). This technique, an extension of network address translation (NAT), is
known as IP address masquerading and typically allows the use of a very inexpensive ISP account.

Automatic Configuration of Attached PCs by DHCP

The routers can dynamically assign network configuration information, including IP, gateway, and
domain name server (DNS) addresses, to attached PCs on the LAN using the Dynamic Host
Configuration Protocol (DHCP). This feature greatly simplifies configuration of LAN-attached
workstations.

Security

The Model RT328/RH348 router is equipped with several features designed to maintain security.
These security features are 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.
1-4 Introduction