ZyXEL Communications ZyWALL 10/10 User Manual page 39

ZyWALL 10/10 II/50 Internet Security Gateway
Network Address Translation (NAT)
NAT (Network Address Translation - NAT, RFC 1631) allows the translation of an Internet Protocol address
used within one network to a different IP address known within another network.
Port Forwarding
Use this feature to forward incoming service requests to a server on your local network. You may enter a
single port number or a range of port numbers to be forwarded, and the local IP address of the desired server.
DHCP (Dynamic Host Configuration Protocol)
DHCP (Dynamic Host Configuration Protocol) allows the individual clients (workstations) to obtain the
TCP/IP configuration at start-up from a centralized DHCP server. The ZyWALL has built-in DHCP server
capability, enabled by default, which means it can assign IP addresses, an IP default gateway and DNS
servers to Windows 9X, Windows NT and other systems that support the DHCP client. The ZyWALL can
now also act as a surrogate DHCP server (DHCP Relay) where it relays IP address assignment from the
actual real DHCP server to the clients.
Full Network Management
This feature allows you to access the SMT (System Management Terminal) through the console port or telnet
connection.
RoadRunner Support
In addition to standard cable modem services, the ZyWALL supports Time Warner's RoadRunner Service.
Time and Date
The ZyWALL 10 II and 50 each have a Real Time Chip (RTC) that keeps track of the time and date. All
three models allow you to get the current time and date from an external server when you turn on your
ZyWALL. You can also set the time manually.
Logging and Tracing
♦ Built-in message logging and packet tracing.
♦ Unix syslog facility support.
Upgrade ZyWALL Firmware via LAN
The firmware of the ZyWALL 10/10 II/50 can be upgraded via the LAN.
Embedded FTP and TFTP Servers
The ZyWALL's embedded FTP and TFTP Servers enable fast firmware upgrades as well as configuration
file backups and restoration.
Getting to Know Your ZyWALL 1-3