cojocar/tomato-static-mac.md

Last active July 1, 2020 16:22

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Set a fixed MAC address on a TAP interface (OpenVPN client) on Tomato Firmware 1.28.0000 MIPSR2-101 K26 USB AIO-64K and maybe on others

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tomato-static-mac.md

How to set a fixed MAC address on a TAP interface (OpenVPN client) on Tomato Firmware

Problem

Using the lladdr 00:11:22:33:44:55 option in the OpenVPN client custom configuration form doesn't change the MAC of the tap interface.

Solution

Paste this in the custom configuration box:

script-security 2
up "/bin/sh -c '/sbin/ifconfig ${dev} down; /usr/sbin/ip link set ${dev} address 00:11:22:33:44:55; /sbin/ifconfig ${dev} up;' "

The OpenVPN client sets dev as an environment variable.

Explanation

The lladdr option does not work because the interface is already up, so OpenVPN (2.2.2) cannot set a MAC address (Device busy).

richieboymx commented Jul 1, 2020

Hello,

Client connects to server, however the fixed Mac is not showing on the server client list; I'm getting the following message in the client log:

/bin/sh -c /sbin/ifconfig ${dev} down; /usr/sbin/ip link set ${dev} address 00:11:22:33:44:55; /sbin/ifconfig ${dev} up; tap11 1500 1584 192.168.1.
[: bad number

Am I missing something on my server settings? I have FreshTomato Version 2020.3. Thanks.