====== Ubiquiti - Security Gateway - Change the MAC Address ======

SSH into the Cloud Key.

Create a **/usr/lib/unifi/data/sites/default/config.gateway.json** file:

<file json /usr/lib/unifi/data/sites/default/config.gateway.json>
{
    "interfaces": {
        "ethernet": {
            "eth2": {
                "mac": "00:00:00:00:00:00"
            }
        }
    }
}
</file>

<WRAP info>
**NOTE:**  

  * Change that MAC address to whatever you need it to be.

  * Change the NIC (eth2 in the example) to whichever is the WAN Port.
    * On the USG 4 Pro, eth2 is the WAN1 port. eth0 is LAN1.  But this may differ.
      * Check by ssh into the USG, then grep for that interface: <code bash>
ip addr|grep -A2 eth2:
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 1.2.3.4/22 brd 255.255.255.255 scope global eth2
</code>
        * The **1.2.3.4** should be the external IP.
        * The **00:00:00:00:00:00** should be the correct MAC address.
</WRAP>

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