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How to override the WAN MAC address

My ISP's fiber optic modem refused to let any device connect unless it had a specific MAC address. When I got a TP-Link Archer C7 AC1750 router and installed OpenWRT on it, this proved a problem. The MAC address I set through the web interface did not actually override the router's WAN MAC address. I found a bug describing this issue in OpenWRT's tracker. Rather than edit /etc/config/network like one of the comments suggested, I wrote an rc script that set the MAC address.

/etc/rc.d/99set_mac

#! /bin/sh /etc/rc.common

START=99

MAC_ADDRESS=00:23:69:15:5C:81
MAC_IF=eth0.2

start() {
    ifconfig "$MAC_IF" down
    ifconfig "$MAC_IF" hw ether "$MAC_ADDRESS"
    ifconfig "$MAC_IF" up
}

Reference


Tags: how-to, sysadmin.