On Tue, Jun 27, 2017 at 07:57:42PM +0100, Joe Holden wrote: > It looks like setting the mtu on cnmac interfaces doesn't quite work as > expected, whatever the mtu is set to the upper limit appears to be 1510 > as although it will transmit frames of any arbitary size (e.g 2000 > bytes), the reply never makes it back (confirmed from an attached box) > unless the frame is =< 1510.
I just committed a patch that lets MTU change happen on the fly with cnmac(4). If you are using release 6.1, you have to temporarily bring down the interface, or reboot, when changing MTU on a cnmac(4) interface.
