$gnet1=array();
gnet:ip of the control machine:serial port:channel Channel : 0 : 0/1, 1 : 2/3
$gnet1['id']='gnet:163.220.37.233:16:0';
$gnet1['type']=array('gnet');
Node connected to GNET-1
$gnet1['node']='163.220.37.231';
Interface of this node
$gnet1['ethnode']='eth2';
If you want to use both couples of channels, define 2 gnets variable
Array with all the available machines
$machines=array( $machine1, $gnet1, );