7270v2 V6.06 change MAC HWADDR on eth0 or ethgbr3 port

[cybermaus]

Hello all

Does anyone know how to change the mac hwaddr of the ethernet ports using ar7.cfg?

There is a clear option in there to do this with the dsl line, but these boxes are ATA-IP-Clients. And alas, if I try it with ifconfig, I get a "function not supported"
I can change it for the higher level lan and guest bridges, the ath0/wifi ports, but not the ethernet switch ports. cpmaccfg also does not exist at this version of freetz.

Thanks