someone set my 2 cAP ac devices with same mac address!

RouterOS General
1

I have in an installation 2 CAP AC with the same mac address on eth1 (and eth2) of course acting weird on the same network
How is that possible?
You will notice that the serial number is unique but mac address the same


[admin@CAP-103b] /interface/ethernet> print
Flags: R - RUNNING; S - SLAVE
Columns: NAME, MTU, MAC-ADDRESS, ARP, SWITCH

NAME MTU MAC-ADDRESS ARP SWITCH

0 RS ether1 1500 DC:2C:6E:A1:9E:9C enabled switch1
1 S ether2 1500 DC:2C:6E:A1:9E:9D enabled switch1
[admin@CAP-103b] /interface/ethernet> /sys/routerboard/print
routerboard: yes
board-name: cAP ac
model: RBcAPGi-5acD2nD
revision: r3
serial-number: F9AD0FAF6EA0


[admin@CAP-IDEN-1] /interface/ethernet> print
Flags: R - RUNNING; S - SLAVE
Columns: NAME, MTU, MAC-ADDRESS, ARP, SWITCH

NAME MTU MAC-ADDRESS ARP SWITCH

0 RS ether1 1500 DC:2C:6E:A1:9E:9C enabled switch1
1 S ether2 1500 DC:2C:6E:A1:9E:9D enabled switch1
[admin@CAP-IDEN-1] /interface/ethernet> /sys routerboard/print
routerboard: yes
board-name: cAP ac
model: RBcAPGi-5acD2nD
revision: r3
serial-number: F9AD0F488EB6

2

Paste this on both, and check again if the MACs are equal:

/interface ethernet
:foreach int in=[find] do={
    set $int mac-address=[get $int orig-mac-address]
}
3

I had to post this to find out someone (whom I can’t tell) had changed the mac address… interface reset and ready pfffffff

4

that someone need to understand that two device with same MAC address is bad…


you import backup or script from one to another?

5

I took over this installation and I reset all devices except the cap clients that I modified the settings... I couldn't imagine that they had spoofed a mac address to an existing one in the same network....

They shouldn't have done it...
And I should have reset those as well...

pffffffffff

6

It may have been unintentional. If you make a .backup on one device and restore it on another (not officially supported but works if the two devices are the same model) various things, including the original MAC addresses, are cloned. These can be reset - in Winbox if you open an interface one of the buttons is ‘Reset MAC address’ so you can go through the all of the interfaces and reset them, or script it thought the CLI.

7

Do not blame yourself too much, I made much more serious mistakes in production due to an oversight… (+48 / -48 volt switched…)

8

On eternet interfaces, too bad they didn’t put it also for the wireless interfaces…

9

I have never used the backup tool the last hmmmm 10+years
I always use /export compact…