How to Fix RTL8111F-CG DNS Resolution Problems

How to Fix RTL8111F-CG DNS Resolution Problems

How to Fix RTL8111F-CG DNS Resolution Problems

If you're experiencing DNS resolution issues with the RTL8111F-CG network adapter, it's important to diagnose the root cause and take the necessary steps to resolve the issue. DNS resolution problems can be frustrating, but with a structured approach, you can get things working again. Here's a breakdown of potential causes and step-by-step solutions to fix the issue.

Possible Causes of DNS Resolution Problems

Incorrect DNS Server Settings: If the DNS server settings on your computer are not properly configured, it can lead to DNS resolution failures. This might happen if you are using automatic DNS settings and the network configuration is incorrect.

Driver Issues with RTL8111F-CG: An outdated or corrupted driver for your RTL8111F-CG network card can cause connectivity issues, including DNS resolution problems. The adapter may not function properly if it isn't running the latest driver version.

Network Configuration Issues: Network misconfigurations, such as incorrect IP address settings, or conflicts between DHCP and static IP addresses, can prevent the DNS server from being accessed correctly.

Firewall or Security Software: Firewalls or antivirus programs might block DNS requests. This can cause issues where DNS queries cannot be resolved, even though the physical connection to the network is stable.

Problems with Your Router/Modem: Sometimes the issue is with the router or modem you're using to access the internet. If the router is not correctly resolving DNS queries, it will affect all devices connected to it.

Step-by-Step Solution to Fix DNS Resolution Problems

Step 1: Check DNS Server Settings Open Network Settings: For Windows: Right-click the network icon in the system tray > "Open Network & Internet Settings." For macOS: Go to "System Preferences" > "Network." Edit DNS Server Settings:

Windows: Under the "Status" tab, click "Change adapter settings." Right-click your network connection, select "Properties," then select "Internet Protocol Version 4 (TCP/IPv4)." Click "Use the following DNS server addresses" and enter reliable DNS server addresses such as:

Primary DNS: 8.8.8.8 (Google DNS) Secondary DNS: 8.8.4.4 (Google DNS)

macOS: Select your active network, click "Advanced," then go to the "DNS" tab. Add Google's DNS (8.8.8.8 and 8.8.4.4) or another trusted DNS service.

Save Changes and Restart the Computer. This should resolve any DNS configuration issues. Step 2: Update RTL8111F-CG Driver Check for Driver Updates: For Windows, press "Windows + X" and choose "Device Manager." Find "Network adapters" and locate your RTL8111F-CG adapter. Right-click on the adapter and select "Update driver." Choose "Search automatically for updated driver software." Download Latest Driver: If the automatic update doesn't work, go to the official Realtek website or the manufacturer’s support page and download the latest driver for your RTL8111F-CG. Install the driver and restart your computer. Step 3: Reset Network Configuration Reset TCP/IP Stack: Open Command Prompt as Administrator by typing "cmd" in the Start menu, then right-click and select "Run as Administrator." Type the following command and press Enter: bash netsh int ip reset Flush DNS Cache: In the same Command Prompt, type: bash ipconfig /flushdns Restart Your Computer. This will reset your network settings and clear any cached DNS information. Step 4: Disable Firewall/Antivirus Temporarily

Disable Security Software: Temporarily disable any firewall or antivirus software that could be blocking DNS traffic. This varies depending on the software you're using, so check the software’s settings to turn it off.

Test DNS Resolution: After disabling the firewall/antivirus, try to access websites. If DNS resolution works, it’s likely the firewall was blocking DNS requests.

Re-enable Security Software after confirming whether the firewall was the cause.

Step 5: Restart or Reset Your Router/Modem Restart Your Router/Modem: Unplug your router/modem for about 10-20 seconds, then plug it back in. Wait for it to reboot and try connecting to the internet again. Check DNS Settings on the Router: Log into your router’s admin panel (usually via a web browser with the router’s IP address, like 192.168.1.1). Check that the DNS settings are correctly configured or set to automatic. Update Router Firmware: Check if there are firmware updates available for your router. Installing the latest firmware can help resolve DNS and other connectivity issues. Step 6: Test DNS with Command Line Ping a Domain: Open Command Prompt and type: bash ping google.com If it resolves, then your DNS is working correctly. If not, the problem persists. Use a Different DNS Server: If you suspect the DNS service is the issue, try changing it to an alternative like OpenDNS (Primary: 208.67.222.222, Secondary: 208.67.220.220) or Cloudflare (Primary: 1.1.1.1, Secondary: 1.0.0.1).

Conclusion

By following these steps, you should be able to resolve most DNS resolution problems associated with your RTL8111F-CG network adapter. Whether it’s a misconfiguration in your DNS settings, outdated drivers, or issues with your router, these solutions provide a clear, structured approach to identifying and solving the problem.

If the issue persists even after following all these steps, there may be a deeper hardware or network issue that might require additional troubleshooting or professional assistance.