Ultra 9 Double Dhcp Solved
By limiting the DHCP scope to just a couple of reserved IPs, you ensure that:
✅ Only your laptop & the Ultra can connect to TP-Link’s WiFi.
✅ No unintended devices will join the TP-Link WiFi network.
✅ You can expand the DHCP range if the Ultra fails and you need to restore wired LAN access.
How to Implement This in TP-Link:
1. Reduce DHCP Scope
• Set DHCP range to 10.10.19.26 – 10.10.19.27 (for just our Stick PC & Ultra). So extra manual ip connects work fine.
• This prevents random WiFi devices from joining.
2. Reserve Static IPs for Critical Devices
• Default Gateway: 10.10.19.25
• Laptop WiFi: 10.10.19.26
• Ultra WAN2: 10.10.19.27
• (If needed, allow one more for an emergency device)
3. Verify DHCP Settings
• Check Lease Time (longer lease means fewer refresh issues).
• DNS: 8.8.8.8 & 1.1.1.1
4. Future Recovery Plan
• If the Ultra completely fails, manually increase the DHCP range to allow wired access for LAN devices.
• Alternatively, manually assign an IP (10.10.19.50 or similar) to a wired device for emergency access.Result
✔ Normal operation: Only the Stick PC & Ultra can get IPs via WiFi.
✔ If Ultra fails: Expand manually DHCP or assign manual IPs to restore access.
✔ 5G SIM can still provide access if needed.
This setup keeps TP-Link isolated and secure while allowing quick reconfiguration in an emergency as well as both fail-over and balancing. There being two levels of fail-over where first is for broadband drops and fails and second is where the main Ultra router ceases to function. 🚀