Port Forwarding; Virtual Private Networks; Related Documentation - Motorola SBG900 User Manual

Overview Installation Troubleshooting Contact

Port Forwarding

Port forwarding is the configuration of SBG logical data ports for applications having special network
requirements.
The SBG900 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:
Protocol Port
FTP 20, 21
HTTP 80
NTP 123
Secure Shell 22
SMTP e-mail 25
Telnet 23
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

Virtual Private Networks

The SBG900 allows multiple
Internet through the SBG900. The SBG900:
•
Is compatible with Point to Point Tunneling Protocol (PPTP) and Layer 2 Tunneling Protocol (L2TP)
•
Is fully interoperable with any

Related Documentation

The following documents also provide information you can use with the SBG900:
•
SURFboard Wireless Cable Modem Gateway Quick Start Guide
•
PCC11b Wireless Card Quick Start Guide and on-line help on the PCC11b and USB11b Wireless Adapter
CD-ROM
•
USB11b Wireless Adapter Quick Start Guide and on-line help on the PCC11b and USB11b Wireless Adapter
CD-ROM
For the most recent documentation, visit the
http://broadband.motorola.com.
Home Print
Configuration: Basic Gateway TCP/IP Wireless USB
tunnel VPN pass-through
IPSec client or gateway and
Product Documentation
X
14
Exit
FAQ Specifications Glossary License
Gateway > PORT FORWARDING — config
operation to securely connect remote computers over the
ANX certified IPSec stacks
page on the Motorola Broadband website
SBG900 User Guide
Page.