Force a static HWaddr to tinc interface

[Ville Mattila]

Hi,

I have been working with tinc network where one host will provide the IP
addresses over DHCP to each connected node. Tinc runs in switch mode.

It seems that the HWaddr of the tinc interface is regenerated every time
when tinc is (re)started. As a result, DHCP server will assign a new IP for
the host. Is there any configuration variable we could use to avoid HWaddr
changing?

Currently, I have added a short snippet into tinc-up script that persists
the (once given) HWaddr to a file and tries to reset it before starting
dhclient. This works, but I feel it a bit hacky solution...

-- tinc-up --

#!/bin/sh
set -e

MACFILE="/etc/tinc/mynet/mac"
if [ -e $MACFILE ]; then
  MAC=`cat $MACFILE`
  ifconfig $INTERFACE hw ether $MAC
fi

dhclient $INTERFACE &
MAC=`ip link show mynet | awk '/ether/ {print $2}'`
echo $MAC > $MACFILE

-- tinc-up ends --

Best regards,
Ville
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