Problem with MAC address

[hcual]

Hello!
I have the Asus RT-AC86U with the current Merlin firmware version. I've attempted to change the MAC address, but the router retains its old MAC address. I've also tried this with the Asus firmware, but encountered the same result. The MAC address cannot be changed.
On an Asus RT-AC88U, I encountered the same issue. I was able to change the MAC address using DD-WRT, but not with Merlin or Asus firmware.
Is there another solution to change the MAC address without using the GUI?

 

[ColinTaylor]

Which MAC address are you talking about? The router has multiple MAC addresses.

Why do you want to change it?

 

[hcual]

I mean the WAN MAC.
I need a specific MAC address that is registered with my ISP to obtain a static IP.

 

[ColinTaylor]

Changing it in the WAN GUI settings has always worked for me (but I don't have an RT-AC86U). What WAN Connection Type are you using?

 

[hcual]

Automatic IP

 

[ColinTaylor]

All I can suggest is that you reboot your router. Then log into the GUI, save the System Log - General Log and then upload the complete log to somewhere like pastebin for us to look at. We might be able to spot something.

 

[hcual]

syslog ac86u - Pastebin

Pastebin.pl is a website where you can store code/text online for a set period of time and share to anybody on earth

pastebin.pl

 

[ColinTaylor]

Try disabling IPv6 and seeing if that makes a difference.

 

[hcual]

syslog ipv6 - Pastebin

Pastebin.pl is a website where you can store code/text online for a set period of time and share to anybody on earth

pastebin.pl

Disabling IPv6 doesn't resolve the issue either.

 

[ColinTaylor]

syslog ipv6 - Pastebin

Pastebin.pl is a website where you can store code/text online for a set period of time and share to anybody on earth

pastebin.pl

Disabling IPv6 doesn't resolve the issue either.

Reboot the router just to be sure.

Then SSH into the router and post the output of this command:

ifconfig eth0

 

[hcual]

ASUSWRT-Merlin RT-AC86U 386.12_4 Wed Nov 22 03:37:45 UTC 2023

rwz@RT-AC86U-8E28:/tmp/home/root# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 14:CC:20:8A:2D:E7

          inet addr:100.75.53.147  Bcast:100.75.127.255  Mask:255.255.128.0

          UP BROADCAST RUNNING ALLMULTI MULTICAST  MTU:1500  Metric:1

          RX packets:131978 errors:0 dropped:0 overruns:0 frame:0

          TX packets:123492 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:171763730 (163.8 MiB)  TX bytes:19056837 (18.1 MiB)

The HWaddr14:CC:20:8A:2D:E7 is the MAC address that I need as the WAN MAC.

 

[ColinTaylor]

Well it looks like it's working as expected. The WAN interface (eth0) has your cloned MAC address (14:CC:20:8A:2D:E7). This won't change your LAN MAC addresses though.

So if you're not getting the WAN IP address you expect I would say this is an ISP issue.

 

[hcual]

Then I'll have to bother my ISP.
However, why is a different MAC displayed in the overview?
Even using 'arp' shows me the MAC from the overview.

arp 10.10.10.1
Adresse Hardware-Typ Hardware-Adresse Optionen Maske Schnittstelle
_gateway                 ether   24:4b:fe:e4:8e:28   C                     wlp3s0

 

[ColinTaylor]

However, why is a different MAC displayed in the overview?
Even using 'arp' shows me the MAC from the overview.

arp 10.10.10.1
Adresse Hardware-Typ Hardware-Adresse Optionen Maske Schnittstelle
_gateway                 ether   24:4b:fe:e4:8e:28   C                     wlp3s0

Because you are looking at your router's LAN interface not its WAN interface.

 

[hcual]

Okay, thank you for your patience with me.
I've learned a bit more again.
So, I'll bother my ISP on Monday.
Thanks again, really appreciate it.