The router shows 2 MAC addresses for the same wifi NIC

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The router shows 2 MAC addresses for the same wifi NIC

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The router shows 2 MAC addresses for the same wifi NIC
The router shows 2 MAC addresses for the same wifi NIC
2023-02-05 12:04:25 - last edited 2023-02-06 09:12:14
Model: TL-WR1043N  
Hardware Version: V1
Firmware Version:

The problem exists with routers WR842ND V 1 and WR1043ND v1

 

I have a laptop which runs Ubuntu server 22.04.01 and is connected using WiFi to a TP_LINK TL-WR842ND or TL-WR1043ND router.

I have reserved the ip address 192.168.11.206 for the laptop.

 

Some times the router allocates a dynamic ip address to the laptop but when it does that the MAC address is different than the MAC address of the wifi interface.

 

I use the ifconfig -a command to get the MAC address of the laptop’s wireless card.

wlp9s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

inet 192.168.11.100 netmask 255.255.255.0 broadcast 192.168.11.255

inet6 fe80::6a5d:43ff:fec9:91ae prefixlen 64 scopeid 0x20<link>

ether 68:5d:43:c9:91:ae txqueuelen 1000 (Ethernet)

RX packets 2638130 bytes 2559141941 (2.5 GB)

RX errors 0 dropped 29 overruns 0 frame 0

TX packets 1141255 bytes 472250493 (472.2 MB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

 

The laptop is named Vertiskos. As you can see in the router has allocated a second dynamic ip address to the laptop.

 

 

DHCP Clients List

ID

Client Name

MAC Address

Assigned IP

Lease Time

1

axios-dell

40-23-43-E1-4A-F3      

192.168.11.200       

Permanent

2     

tasmota-E2A592-1426  

 98-F4-AB-E2-A5-92

192.168.11.201

Permanent

3

Tapo_SmartPlug

B4-B0-24-E2-C9-30

192.168.11.203

Permanent

4

paiko

C4-17-FE-5D-8B-F3

192.168.11.208

Permanent

5

vertiskos

68-5D-43-C9-91-AE

192.168.11.206

Permanent

6

TL-WA860RE

D2-6E-0E-4D-7B-13

192.168.11.205

Permanent

7

vertiskos

D6-6E-0E-C9-91-AE

192.168.11.100

01:23:43

 

 

 

The ifconfig command shows ip 192.168.11.100 for MAC address 68:5d:43:c9:91:ae but the router listing shows that ip address for MAC D6-6E-0E-C9-91-AE

 

When I reboot the router the dynamic address initially is not allocated but sometime later the problem reappears.

I have the same problem with another TP-LINK router WL1043ND. I think both routers use the same software. Al least the GUI is the same.

 

Any suggestions are welcomed.

 

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1 Accepted Solution
Re:The router shows 2 MAC addresses for the same wifi NIC-Solution
2023-02-05 17:42:12 - last edited 2023-02-06 09:12:14

  @Napoleon 

 

Hi,

 

Is the Ubuntu laptop directly connected to the router or is it connected via the WA860RE range extender to the router?

 

Can you power off the WA860RE and then check again if the second IP and MAC address still show up?

 

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Re:The router shows 2 MAC addresses for the same wifi NIC-Solution
2023-02-05 17:42:12 - last edited 2023-02-06 09:12:14

  @Napoleon 

 

Hi,

 

Is the Ubuntu laptop directly connected to the router or is it connected via the WA860RE range extender to the router?

 

Can you power off the WA860RE and then check again if the second IP and MAC address still show up?

 

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Re:The router shows 2 MAC addresses for the same wifi NIC
2023-02-05 21:25:07

  @woozle 

Thanks for the reply.

I removed the repeater and I rebooted the router. I will see if the problem will appear again.

But I do not understand why a repeater would change the MAC address.

Napoleon

 

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Re:The router shows 2 MAC addresses for the same wifi NIC
2023-02-06 09:11:37

  @woozle 

It seems that the problem was created by the repeater because everything works fine since I turned it off.

I do not understand why, but I am happy that the problem is solved.

 

Thanks for the suggestion

Napoleon Maou

 

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Re:The router shows 2 MAC addresses for the same wifi NIC
2023-02-07 06:52:37

@Napoleon 

 

Hi, you may refer to this article to understand what is called Proxy Mode on a range extender, then you may understand why.

If my reply helps with the issue, please click on the arrow pointing upward. If it solves your issue, please click the star to mark it as a "Recommended Solution".
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