I recently replaced my old Synology mesh system with a new Asus XT9 wifi 6 mesh system (two devices, one router and one access point, connected by wireless backhaul). As you do, with a new router, I have been 'tweaking' the settings, primarily to improve security. So it was a bit disappointing that in the last week or so I have been getting warnings from Eset antivirus that 'a device on your network is sending malicious traffic: duplicate ip address.' This turned out to be the access point, which seemed to have two mac addresses, each of which was being served the same ip address. Sometimes the warning from Eset was more urgent, saying that 'a device on your network is sending an ARP poisoning attack' - again the access point. Strangely, doing a full network scan showed no problems and using the router app and checking security showed very strong security. Wireless network speed dropped from around 400 Mb/s to around 100 Mb/s download.
Last night I found the solution: I had set the network to use WPA2/WPA3 security - because (like many people, I imagine) I have older devices which can only use WPA2 along with newer ones which can use WPA3. Setting this to WPA2 (personal) only has resolved the problem. Now wifi network speed is back up to 400+ Mb/s and no duplicate IP addresses on the network.
I hope this is helpful for anyone struggling with mysterious duplicate ip addresses on their home network. (Of course there could be other causes.)
Last night I found the solution: I had set the network to use WPA2/WPA3 security - because (like many people, I imagine) I have older devices which can only use WPA2 along with newer ones which can use WPA3. Setting this to WPA2 (personal) only has resolved the problem. Now wifi network speed is back up to 400+ Mb/s and no duplicate IP addresses on the network.
I hope this is helpful for anyone struggling with mysterious duplicate ip addresses on their home network. (Of course there could be other causes.)
- Windows Build/Version
- Version 22H2 OS Build 22621.1848
My Computers
System One System Two
-
- OS
- Windows 11
- Computer type
- PC/Desktop
- Manufacturer/Model
- Home built
- CPU
- Ryzen 3900x
- Motherboard
- Gigabyte Aorus Master x570 rel 1.0
- Memory
- 32GB (2x16) @ 3600 MHz Corsair Vengeance LPX
- Graphics Card(s)
- Gigabyte Windforce RTX 2080
- Sound Card
- No separate sound card.
- Monitor(s) Displays
- Dell U2718Q
- Screen Resolution
- 3840x2160
- Hard Drives
- 1TB WD-Black SN850; 1TB Samsung Sata 850 Evo; 4 TB WD Blue Sata SA510 2.5''; 4TB Samsung Sata SSD 870 EVO 2.5".
- PSU
- Be Quiet Dark Power Pro 11 750W
- Case
- Lian Li PC-8FIB
- Cooling
- CPU: Noctua NH-U12A; Case: BeQuiet + Lian Li fans.
- Keyboard
- Steelseries Apex 7 brown keys.
- Mouse
- Logitech (wired) G403
- Internet Speed
- 940 Mb/s down; 105 Mb/s up
- Browser
- Edge (Chromium)
- Antivirus
- Eset Internet Security
- Other Info
- Pioneer blu-ray optical drive.
-
- Operating System
- Windows 11
- Computer type
- Laptop
- Manufacturer/Model
- Dell Inspiron 7373 2-in-1
- CPU
- Intel Core i7 8th Generation
- Motherboard
- Dell 0HG1FH (U3E1)
- Memory
- 8GB DDR4
- Graphics card(s)
- Intel UHD Graphics 620 (Dell)
- Sound Card
- Realtek Audio (on motherboard)
- Monitor(s) Displays
- Touch screen generic monitor
- Screen Resolution
- 1920x1080
- Hard Drives
- 256GB Micron SATA SSD.
- Browser
- Edge Chromium
- Antivirus
- Eset Internet Security
- Other Info
- Dell says this system is not Windows 11 capable, but Microsoft seems happy with it.