OK I need that the node_id = MAC ADDRESS of the router without les :
This lines give a good result
## Determine nodo_id for the first time. Then it could be changed.
LAN_MAC=$(ifconfig eth0 | grep HWaddr | awk '{print $5}')
NODE_ID=$(echo $LAN_MAC| awk -F: '{print $1$2$3$4$5$6}')
So, is it possible that change affect other variables ?
Helene Gauthier