DIR-855L Manual

The DIR-855L is a high-performance wireless router featuring dual-band technology, Gigabit Ethernet ports, advanced security features, Quality of Service (QoS) management, and easy setup wizard. Below are key sections covering features, installation, configuration, security settings, troubleshooting, and specifications.

Features at a Glance

Key components: Dual-band wireless router, Ethernet ports, Power adapter, Setup CD, Quick Installation Guide.

Feature	Description
Wireless Standards	802.11a/b/g/n dual-band support
Ethernet Ports	4 Gigabit LAN ports, 1 Gigabit WAN port
USB Port	For network storage and printer sharing
Security	WPA/WPA2 encryption, SPI firewall
QoS	Traffic prioritization for better performance
Setup Wizard	Easy web-based configuration
Reset Button	Factory reset functionality
Power Button	Turns router on/off
WPS Button	Wi-Fi Protected Setup for easy connection
LED Indicators	Power, Internet, Wireless, Ethernet status

Installation

Unpack and inspect contents. Place router in central location for optimal coverage.

1. Connect to modem: Use Ethernet cable from modem to WAN port.
2. Connect computers: Use Ethernet cables to LAN ports.
3. Connect power: Plug power adapter into router and wall outlet.
4. Power on: Press power button; wait for LEDs to stabilize.

WARNING! Keep router away from heat sources and moisture. Ensure proper ventilation.

First-Time Setup

Access router configuration via web browser.

1. Connect computer: Use Ethernet cable or connect to default wireless network.
2. Open browser: Navigate to http://dlinkrouter.local or 192.168.0.1
3. Login: Use default credentials (admin/password).
4. Run setup wizard: Follow on-screen instructions for internet connection.
5. Configure wireless: Set SSID and security settings.

CAUTION! Change default password immediately for security.

Specifications

• Wireless Standards: 802.11a/b/g/n
• Frequency Bands: 2.4GHz and 5GHz
• Ethernet Ports: 4x Gigabit LAN, 1x Gigabit WAN
• USB Port: 2.0 for storage and printer sharing
• Security: WEP, WPA, WPA2, SPI firewall
• Antennas: 3 detachable high-gain antennas
• Power Supply: 12V DC, 1.5A
• Operating Temp: 0°C to 40°C
• Dimensions: 200 x 150 x 35 mm

Controls and Settings

Access web interface via browser. Front Panel: Power, WPS, Reset buttons, LED indicators.

Web Interface: Basic Setup, Wireless Settings, Advanced, Tools, Status.

Basic Setup: Internet connection type (DHCP, PPPoE, Static). Wireless: SSID, security (WPA2 recommended), channel selection. Advanced: Port forwarding, QoS, firewall settings. Tools: Admin password, system backup, firmware update. Status: Connection status, device information.

Connecting Devices

Wired: Ethernet cables to LAN ports. Wireless: Connect to SSID with security key.

1. Wired connection: Connect device to LAN port with Ethernet cable.
2. Wireless connection: Select network SSID, enter security key.
3. WPS connection: Press WPS button on router, then on device within 2 minutes.

Tip: Use 5GHz band for less interference and better performance.

Advanced Features

Quality of Service (QoS): Prioritize traffic for gaming, streaming, VoIP.

1. Access QoS settings in web interface Advanced section.
2. Enable QoS and set priority levels for different applications.
3. Port Forwarding: Forward specific ports to internal devices.
4. Guest Network: Create separate wireless network for visitors.
5. Parental Controls: Restrict internet access by schedule or content.
6. USB Sharing: Connect storage device for network file sharing.

WARNING! Save configuration changes before exiting interface.

Security Settings

Wireless Security: Use WPA2-Personal with strong password. Firewall: Enable SPI firewall protection. Admin Access: Change default login credentials.

Maintenance

Regular firmware updates: Check for updates in Tools section. Reboot periodically for optimal performance.

CAUTION! Do not interrupt firmware update process.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2025 D-Link Corporation; all rights reserved. For support, visit www.dlink.com or contact 1-800-326-1688.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No internet connection	Modem/WAN connection	Check WAN cable; reboot modem and router; verify ISP settings.
Wireless devices cannot connect	Security settings/range	Verify security key; check wireless mode; move closer to router.
Slow wireless speed	Interference/channel	Change wireless channel; use 5GHz band; reduce interference sources.
Router not responding	Power/overheating	Check power connection; allow to cool; perform factory reset.
USB device not recognized	Format/compatibility	Use FAT32 format; check device compatibility; restart router.

Reset: Hold reset button for 10 seconds to restore factory defaults.

Service: 1-800-326-1688; www.dlink.com