host#  ifconfig eth0  0.0.0.0  promisc up
                                                  OR
host#  ifconfig eth0  0.0.0.0  promisc up         

when i used to give either of above ,system is hanging.

eth0 is already enable in my pc as 192.168.12.2 .

what is promisc mode  ? how can i enable / disable ?

one more place  where i was strucking is

when giving

uml_switch  -unix -hub  -tap tap0

PC is hanging what is wrong here ? how xcan i connect host tap device 2 uml eth0 device  ?

please help me out