User's Manual
Table Of Contents
- Preface
- Product Overview
- Installation
- Configuration
- Web-based Configuration Utility
- Internet Connection Setup Wizard (3G Mode)
- Manual Configuration (3G Mode)
- Internet Connection Setup Wizard (WAN Mode)
- Manual Configuration (WAN Mode)
- Wireless Settings
- Network Settings
- Virtual Server
- Port Forwarding
- Application Rules
- QoS Engine
- Network Filters
- Website Filters
- Firewall Settings
- Advanced Wireless Settings
- Wi-Fi Protected Setup
- Advanced Network Settings
- Administrator Settings
- Time Settings
- E-mail Settings
- System Settings
- Update Firmware
- DDNS
- System Check
- Schedules
- Device Information
- Logs
- Statistics
- Internet Sessions
- Wireless
- Support
- Web-based Configuration Utility
- Wireless Security
- Connect to a Wireless Network
- Troubleshooting
- Wireless Basics
- Networking Basics
91D-Link DIR-412 User Manual
Section 6 - Troubleshooting
You should start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a
fragmented packet. Take that value and add 28 to the value to account for the various TCP/IP headers. For example,
lets say that 1452 was the proper value, the actual MTU size would be 1480, which is the optimum for the network
we’re working with (1452+28=1480).
Once you nd your MTU, you can now congure your router with the proper MTU size.
To change the MTU rate on your router follow the steps below:
• Open your browser, enter the IP address of your router (192.168.0.1) and click OK.
• Enter your username (admin) and password (blank by default). Click OK to enter the web conguration
page for the device.
• Click on Setup>Internet and then click Manual Internet Connection Setup.
• To change the MTU enter the number in the MTU eld and click Save Settings to save your settings.
• Test your e-mail. If changing the MTU does not resolve the problem, continue changing the MTU in
increments of ten.