Multihoming Setup in Windows 11

🧭 Dual Homing Setup Guide (Static Routing Edition)

Goal: Connect a single device to two separate networks simultaneously, each with its own gateway, while maintaining predictable routing behavior.

🛠️ Prerequisites

• Two active network interfaces (e.g., Ethernet + Wi-Fi)
• IP addresses assigned to each interface
• Administrative access to the system
• Basic understanding of routing tables and gateways

📋 Step-by-Step Instructions

1. Assign IPs:
   • Interface A: 192.168.1.100/24, Gateway: 192.168.1.1
   • Interface B: 10.0.0.100/24, Gateway: 10.0.0.1
2. Disable Automatic Metric Assignment (Windows):
   • Go to Network Connections
   • Right-click adapter → Properties → IPv4 → Advanced
   • Uncheck “Automatic metric” and assign manual values (e.g., LAN: 10, VPN: 20)
3. Identify Interface Numbers:

   route print
         

   Scroll to the Interface List section. Note the number next to each adapter (e.g., 12...Ethernet, 13...Wi-Fi).

4. Set Static Routes with Interface Targeting:

   route -p add 192.168.1.0 mask 255.255.255.0 192.168.1.1 IF 12 metric 10
   route -p add 10.0.0.0 mask 255.255.255.0 10.0.0.1 IF 13 metric 20
         

   Replace IF 12 and IF 13 with your actual interface numbers from route print.

5. Verify Routing Table:

   route print
   Get-NetRoute
         

   Confirm that each subnet routes through its intended gateway and interface.

6. Test Connectivity:
   • Ping devices on both networks
   • Use tracert or Test-NetConnection to verify routing paths

🧯 Troubleshooting Tips

• Check for overlapping subnets or gateway conflicts
• Use Wireshark or netstat -rn to inspect traffic flow
• Assign interface-specific DNS or use conditional forwarding

📦 Optional Enhancements

• Firewall rules per interface
• App-specific NIC binding via netsh or third-party tools
• Monitoring scripts for uptime and route changes