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Change MAC address on VPN Concentrator interfaces?

Posted on 2008-10-01
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Last Modified: 2008-10-01
Hi,  we have several Cisco VPN Concentrator 3005s... We have had a major error with one in which the interfaces show the SAME MAC address for public and the private interface.

Is there a way to change this?  This is not the case on any of the other devices.

Thanks.
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Question by:dataroad
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by:arnold
ID: 22617687
Check the configuration and you will find a directive setting the mac address presumably to a virtual interface.  Search the config for the mac address.  You might find a single instance where the mac address was applied for some reason to the wrong interface.

While it is not advisable, it might not cause any problems.  A problem occurs if two devices on the same network have the same MAC address, in your case, the interfaces are connected to two separate/segmented networks/switches.
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by:dataroad
ID: 22617733
I tried searching through the config in order to change the MAC address on the code; but, no visible MAC address information was found.

As a solution, I deleted all files on the device and then TFTP a config from a good known device. This wiped out the Mac Addresses and replace them with the original. For some reason, the first config was corrupted, I guess.

Thanks,
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arnold earned 1000 total points
ID: 22617797
Possibly corrupted or was being setup as for a clustered VPN where the "virtual" IP/interface needs to maintain the same IP/mac address and mistakenly the setting was applied to the wrong interface or set the wrong parameters.
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