Operation Manual

Appendix A Product Specifications and Wall-Mounting Instructions
NBG318S User’s Guide
241
Network Address
Translation (NAT)
Each computer on your network must have its own unique IP address.
Use NAT to convert a single public IP address to multiple private IP
addresses for the computers on your network.
Firewall You can configure firewall on the ZyXEL Device for secure Internet
access. When the firewall is on, by default, all incoming traffic from the
Internet to your network is blocked unless it is initiated from your
network. This means that probes from the outside to your network are
not allowed, but you can safely browse the Internet and download files
for example.
Content Filter The NBG318S blocks or allows access to web sites that you specify and
blocks access to web sites with URLs that contain keywords that you
specify. You can define time periods and days during which content
filtering is enabled. You can also include or exclude particular computers
on your network from content filtering.
You can also subscribe to category-based content filtering that allows
your NBG318S to check web sites against an external database.
Bandwidth Management You can efficiently manage traffic on your network by reserving
bandwidth and giving priority to certain types of traffic and/or to particular
computers.
Time and Date Get the current time and date from an external server when you turn on
your NBG318S. You can also set the time manually. These dates and
times are then used in logs.
Port Forwarding If you have a server (mail or web server for example) on your network,
then use this feature to let people access it from the Internet.
DHCP (Dynamic Host
Configuration Protocol)
Use this feature to have the NBG318S assign IP addresses, an IP
default gateway and DNS servers to computers on your network.
Dynamic DNS Support With Dynamic DNS (Domain Name System) support, you can use a
fixed URL, www.zyxel.com for example, with a dynamic IP address. You
must register for this service with a Dynamic DNS service provider.
IP Multicast IP Multicast is used to send traffic to a specific group of computers. The
NBG318S supports versions 1 and 2 of IGMP (Internet Group
Management Protocol) used to join multicast groups (see RFC 2236).
IP Alias IP Alias allows you to subdivide a physical network into logical networks
over the same Ethernet interface with the NBG318S itself as the
gateway for each subnet.
Logging and Tracing Use packet tracing and logs for troubleshooting. You can send logs from
the NBG318S to an external UNIX syslog server.
PPPoE PPPoE mimics a dial-up over Ethernet Internet access connection.
PPTP Encapsulation Point-to-Point Tunneling Protocol (PPTP) enables secure transfer of
data through a Virtual Private Network (VPN). The NBG318S supports
one PPTP connection at a time.
Universal Plug and Play
(UPnP)
The NBG318S can communicate with other UPnP enabled devices in a
network.
Table 102 Firmware Features
FEATURE DESCRIPTION