18 SBG1000 User Guide
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Configuration: Basic Gateway TCP/IP Wireless Print Server USB
If you disable ESSID broadcasting to enable closed network operation, the SBG1000 does not transmit the
network name (ESSID). This provides additional protection because only wireless stations configured with your
network name can communicate with the SBG1000. Closed network operation is an enhancement of the
IEEE 802.11b standard.
For information about configuring a wireless security, see “Setting Up the Wireless LAN”.
Port Forwarding
Port forwarding is the configuration of SBG logical data ports for applications having special network
requirements.
The SBG1000 opens logical data ports when a computer on its LAN sends data, such as e-mail messages or web
data, to the Internet. A logical data port is different from a physical port, such as an Ethernet port. Data from a
protocol must go through certain data ports. Here are the data ports used by some protocols:
Some applications, such as games and videoconferencing, require multiple data ports. If you enable NAT, this can
cause problems because NAT assumes that data sent through one port will return to the same port. You may need
to configure port forwarding to run applications with special requirements.
To configure port forwarding, you must specify an inbound (source) port or range of ports. The inbound port opens
only when data is sent to the inbound port and closes again after a specified time elapses with no data sent to it.
You can configure up to 32 port forwarding entries using the Gateway > PORT FORWARDING — config Page.
Virtual Private Networks
The SBG1000 supports multiple tunnel VPN pass-through operation to securely connect remote computers over
the Internet. The SBG1000:
•Is compatible with Point to Point Tunneling Protocol (PPTP) and Layer 2 Tunneling Protocol (L2TP)
•Is fully interoperable with any IPSec client or gateway and ANX certified IPSec stacks

Protocol Port

FTP 20, 21
HTTP 80
NTP 123
Secure Shell 22
SMTP e-mail 25
Telne t 23