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jackburton
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Question about MAC addresses on Routerboards

Wed Feb 08, 2017 1:46 pm

Hi all,
yesterday, using neighbors discovery in winbox, i noticed that two rb493G routerboards were using the same Mac Address on eth1.
Why ?
How can i force a routerboard to use its real mac address on ETH1 interface ?

Thank you.
 
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baragoon
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Re: Question about MAC addresses on Routerboards

Wed Feb 08, 2017 1:53 pm

Did you tried /interface ethernet reset-mac-address eth1 ?
 
andriys
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Re: Question about MAC addresses on Routerboards

Wed Feb 08, 2017 2:17 pm

Why ?
This often happens when people copy configuration from one board to another using backup/restore instead of export/import.
 
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jackburton
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Re: Question about MAC addresses on Routerboards

Wed Feb 08, 2017 2:58 pm

Did you tried /interface ethernet reset-mac-address eth1 ?
Yes, and the strange thing is that it worked for a routerboard and it didn't for another rb, same model and same firmware...

The Mac address used on eth1 interface is not related with the vendor macaddress.. it start with E4:8D:8C instead of 4c:5E:0c that is the mikrotik mac prefix..

I also noticed that this mac address correspond to BRIDGE interface mac addr...
 
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jackburton
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Re: Question about MAC addresses on Routerboards

Wed Feb 08, 2017 3:01 pm

Why ?
This often happens when people copy configuration from one board to another using backup/restore instead of export/import.
Yes, actually i did a restore from a backup of another RB, but this isn't the eth1 mac address of the cloned router, but an internal mac address, as i mentioned in the previous post, is the same mac of the internal bridge.
 
jarda
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Re: Question about MAC addresses on Routerboards

Sun Mar 19, 2017 11:41 am

Reset router with no defaults and make the config from scratch. Do not transfer backups between the devices or different versions within the same device.

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