User Manual
Table Of Contents
- NBG-418N v2
- User’s Guide
- Introduction
- The Web Configurator
- Connection Wizard
- Modes
- Tutorials
- 5.1 Overview
- 5.2 How to Connect to the Internet from an AP
- 5.3 Configure Wireless Security Using WPS on both your NBG-418N v2 and Wireless Client
- 5.4 Enable and Configure Wireless Security without WPS on your NBG-418N v2
- 5.5 Using Multiple SSIDs on the NBG-418N v2
- 5.6 Installing UPnP in Windows 7 Example
- 5.7 Using Bandwidth Management on the NBG-418N v2
- Technical Reference
- Wireless LAN
- WAN
- LAN
- DHCP Server
- Network Address Translation
- Dynamic DNS
- Static Route
- Firewall
- Content Filter
- Remote Management
- Universal Plug-and-Play (UPnP)
- Bandwidth MGMT
- System
- Logs
- Tools
- Sys OP Mode
- Language
- Troubleshooting
- Customer Support
- IP Addresses and Subnetting
- Pop-up Windows, JavaScripts and Java Permissions
- Setting Up Your Computer’s IP Address
- Wireless LANs
- Common Services
- Legal Information
- Index
Chapter 10 Network Address Translation
NBG-418N v2 User’s Guide
111
1 Jane requests a file from the Real Audio server (port 7070).
2 Port 7070 is a “trigger” port and causes the NBG-418N v2 to record Jane’s computer IP address. The
NBG-418N v2 associates Jane's computer IP address with the "incoming" port range of 6970-7170.
3 The Real Audio server responds using a port number ranging between 6970-7170.
4 The NBG-418N v2 forwards the traffic to Jane’s computer IP address.
5 Only Jane can connect to the Real Audio server until the connection is closed or times out. The NBG-
418N v2 times out in three minutes with UDP (User Datagram Protocol), or two hours with TCP/IP (Transfer
Control Protocol/Internet Protocol).
10.6.5 Two Points To Re me mbe r About Trig g e r Ports
1 Trigger events only happen on data that is coming from inside the NBG-418N v2 and going to the
outside.
2 If an application needs a continuous data stream, that port (range) will be tied up so that another
computer on the LAN can’t trigger it.