netgraph nge device mac address

[freebsd_deamon at gmx.net]

dear list

i yesterday played around with a Prolific PL2301 usb host to host adapter to
connect two machines using netgraph

after

# ngctl mkpeer udbp0: eiface data ether
# ifconfig nge0 inet 192.168.1.1 (192.168.1.2 on the other machine)

i got (ifconfig)

nge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
	ether 00:00:00:00:00:00

and

nge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
	ether 00:00:00:00:00:00

now i wonder how to set the MAC addresses? in man ifconfig i could not find
the answer and ... i think they should be set to something unique, right

besides ... (this might be interrelated) i cannot ping the other host (if i
use "iface data inet" and "ifconfig ng0 10.0.0.1 10.0.0.2" (10.0.0.2 10.0.0.1
on the other machine) i can ping but the connection seems to be instable)

TIA

Zheyu

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