Greetings, network enthusiasts! Today, we are set to embark on an essential task: enhancing the security of your network by blocking traffic between VLANs on Unifi routers such as UDM, UDM-SE, and the Dream Router. Join us as we delve into the nuances of RFC1918 IP ranges and configure firewall rules to safeguard your network effectively.
- Introduction
- Why is this Important for Security?
- Official Documentation and RFC Links
- Instructions
- Conclusion
- Collaboration
- Credits
Before we dive in, let's acquaint ourselves with the RFC1918 which delineates the IP addresses reserved exclusively for private networks. These ranges are as follows:
- 10.0.0.0 to 10.255.255.255
- 172.16.0.0 to 172.31.255.255
- 192.168.0.0 to 192.168.255.255
Armed with this knowledge, we are ready to forge ahead and create an IP group representing these ranges in the Unifi Controller.
Blocking traffic between VLANs is not just a network organization strategy; it's a fundamental security practice. By isolating internal IP ranges, we effectively add a robust layer of security, preventing potential intruders from accessing sensitive areas of our network. It's all about keeping the fortress impenetrable, one firewall rule at a time.
- RFC1918 - Address Allocation for Private Internets
- Ubiquiti Networks - UniFi User Guide
- Creating Firewall Rules on UniFi Controller
- Setting Up IP Groups on UniFi Controller
- Video Walkthrough: UniFi Firewall Rules Setup
- Navigate to Settings > Routing & Firewall > Firewall > Groups.
- Create a new group named "RFC1918 Subnets" and add the following IP ranges:
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
- Head over to Settings > Routing & Firewall > Firewall > Rules IPv4 > LAN IN.
- Develop a new rule with the settings:
- Action: Drop
- Source: RFC1918 Subnets
- Destination: RFC1918 Subnets
- Place this rule above any predefined rules to effectively block traffic from the RFC1918 IP group.
Well, that's all folks! You have now fortified your network by blocking traffic between VLANs on your Unifi router, safeguarding it with the mighty shield of RFC1918 IP ranges. Stay safe, and happy networking!
Your input and experiences are highly valued! Feel free to share your comments, thoughts, and links to other similar resources in the community. Together, we can build a knowledge base that benefits everyone.
This guide has been developed with assistance from gpt4, and was inspired by insights and walkthroughs from Crosstalk Solutions. You can watch their detailed walkthrough in this video.