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Netduino MAC Address Changed ??

Started by bgreer5050, Apr 14 2015 05:50 PM

Network MAC

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5 replies to this topic

#1 bgreer5050

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Posted 14 April 2015 - 05:50 PM

I have a Netduino Plus 2. The MAC address is not the same as it was yesterday. Has anyone seen this before ? I want my Netduinos to go out to a database and get specific values. I wanted to use the MAC address as the unique identifier of the Netduino, but now I am scared to. I know I can change the MAC address back using the MFDeploy utility. Is there a way to do so programatically ?

Original MAC: 5C:86:4A:01:12:46

New MAC: 00:04:a3:00:00:00

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#2 Chris Walker

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Posted 14 April 2015 - 06:16 PM

Hi bgreer5050,

The 00:04:a3 mac is the old "default MAC address" from NETMF. If you're getting that either the board was reflashed without a firmware update...or the config sector can't pull in the MAC address. This really shouldn't happen, either way. If we can find a way to reproduce the issue consistently, we can collaborate with the team in Redmond and address it.

Can you try reflashing your board with Netduino Update (which will clear out the config sector) and then putting the correct address back in using MFDeploy?

Chris

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#3 bgreer5050

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Posted 14 April 2015 - 09:19 PM

I currently have 4.2 on the Netduino. Should I update to 4.3 first ?

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#4 Chris Walker

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Posted 14 April 2015 - 09:47 PM

Hi bgreer5050,

4.3 has the latest bugfixes, so I recommend upgrading. But you shouldn't have to do so to restore your MAC address.

Chris

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#5 bgreer5050

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Posted 16 April 2015 - 02:59 PM

I upgraded to 4.3 and changed the MAC address back to what it should be. So far the problem has not re-occurred. I am guessing that while manipulating the NIC card I was throwing an exception of some kind that caused the issue. I'm not sure, but if I can re-create the problem I will post more details.

Thanks Chris

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#6 Chris Walker

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Posted 12 May 2015 - 03:37 AM

Hi bgreer5050,

Just FYI, the new 4.3.2.1 firmware release automatically reloads the MAC address after upgrading the firmware. Not sure if that solves the core NETMF+lwIP issue for sure--but if the issue crops up for you again I recommend updating to 4.3.2.1 as a first step.

Once we have the main Netduino.IP stack out of pre-release that issue should go away completely if it didn't already do so with 4.3.

Chris