MAC clone with GL-MT300N not working?

alzhao · 2016-04-23T10:45:22.000Z

@jogl, unfortunately we cannot solve this problem so quickly. This problem is not in any of our other models, only MT300N. I am pushing our engineers to solve this.

jogl · 2016-04-23T16:20:58.000Z

OK, thanks. Is it at least clear already if it can be fixed?

Are the AR150 and MT300A not affected?

alzhao · 2016-04-23T16:28:38.000Z

It is not clear about the reason. MT300A and AR150 do not have this problem.

jogl · 2016-04-24T22:47:20.000Z

Doesn’t the MT300A have the same chipset as the MT300N? I see the MT7620A in both descriptions.

alzhao · 2016-04-25T12:33:39.000Z

No.

MT300N uses MTK7620N SoC

MT300A uses MTK7620A Soc

These two chipset has similar specs, but MTK 7620A (MT300A) support PCIE and MMC storage.

kaulazs · 2016-04-29T14:39:03.000Z

Hi,

I have the same router, which has the same problem. It would be good to find out how to solve what problem.

kaulazs · 2016-05-11T21:34:28.000Z

Is there a possibility to change the MAC address by my self? (without UI)

alzhao · 2016-05-12T10:06:53.000Z

@kaulazs, no. It is not the UI. It is something in the driver which I didn’t figure out. So you cannot change by hand.

alzhao · 2016-05-17T17:29:00.000Z

After a thorough test, I have to say that MT300A doesn’t support changing mac address in repeater mode. I made some mistakes in my previous test.

Atheros chips don’t have this issue.

jogl · 2016-05-20T06:10:09.000Z

Does this mean that the MT300A and MT300N both do not support changing the mac address at all? That it is not technically possible? I had ordered a MT300A hoping it would support this feature.

alzhao · 2016-05-20T12:54:37.000Z

To be precise, it doesn’t support changing mac address for wireless interfaces when you use as repeater and ap at the same time.

But it can be used to change mac address when in ap mode only.

jogl · 2016-05-25T23:54:31.000Z

Is it possible to solve this with software in the future? The MT300A is not better than the MT300N in this respect?

thep · 2016-05-26T17:38:12.000Z

Hope that too i bought two and am not using them …

alzhao · 2016-05-27T12:05:56.000Z

~~Hi everyboad, after a deep investigation, I solved this problem.~~

~~Now both MT300A and MT300N can change mac address when used as sta and ap combined.~~

~~I will update the firmware asap.~~

alzhao · 2016-05-27T16:20:24.000Z

I tested and check the driver. Here is the thing.

Where there are multiple virtual interfaces, the wifi driver “rt28xx” only support minor (last 7 bit) change of the MAC address, compared to the permanent MAC address, which is loaded from flash when system start.

So you cannot change the MAC address freely when the wifi driver is loaded. The permanent MAC address is in mtd2. So if you compile your own firmware, you can keep this mtd partition unlocked. You can then change the mac address and write it back. Then reload the wifi driver.

jogl · 2016-05-27T19:56:23.000Z

It is already an improvement if it is possible to do minor changes to the MAC address that can cover some use cases, although some other cases are not covered as easily.

Some other thoughts:

If this is a driver limitation, would it not be theoretically possible to create a driver that changes this behavior (where it loads the MAC address from)? The question is if and how this could be done and how hard it is.
You say that is is possible to keep the mtd partition unlocked if we compile our own firmware. Why is it necessary to be locked in the first place? And wouldn't it be possible to create a firmware that unlocks it, changes the mac address and reload the driver in software only when it is needed (i.e. when one wants to change the MAC address)?

thep · 2016-05-30T06:55:08.000Z

Please can you explain more? should we wait for an update?

or what we should do

alzhao · 2016-05-30T10:50:29.000Z

@jogl,

I am not sure if this is a limitation of the driver or required by the chips. But I believe it is the chips, otherwise it is easy to change the driver. I changed some codes of the driver so that you can change the mac address freely, but once the repeater is connected, all devices are rejected to connect to the ap. It means only the first VAP interface can work successfully.
Several mtd partition is locked, for example uboot, factory (radio data with MAC address) etc. The reason is to protect these data from changing in OpenWrt because they are sensitive. When you compile your own firmware, you can keep these mtd unlocked so that you can just change the data. So I think this is the only way to change mac address freely.

@theP, we cannot provide upgraded version for MT300A and MT300N so that you can change mac address freely. If you want to do this, please use AR150 or our coming AR300M.

jogl · 2016-06-04T21:24:13.000Z

Will you let us know here when a firmware with limited changing is available?
Can you give more information about the AR300M? I could not find it on the site. When will it be out?
Regarding the MT300A and MT300N: It may be a bit too much work for most people to compile the firmware. Maybe two binary versions could be made available for download?
Another possible solution: Wouldn’t it be also possible to only unlock the partition as needed for the interface to change the mac address ? Either a manual unlock/lock button or by just having the button that changes the mac perform a lock/relock after changing the mac address?

Thanks for looking into this problem!

alzhao · 2016-06-07T11:56:10.000Z

@jogl,

Regarding to MT300A/N, we have just updated the firmware v2.20, downloadable from http://www.gl-inet.com/firmware/testing/. The flash is unlocked so you can change the mac address. I still need sometime to write a secure script though. For most people, just don’t change the mac address. If you damage the data, you may never got wifi back. The script will do the following operations.

mtd unlock factory
#change the mac address
mtd lock facotory

AR300M is using Atheros chips, so you can just change the mac address freely. Production finished. We will put on web store soon.

In normal use, just don’t change mac address for MT300A/N because they are not supposed to do this.