"ip addr show" can help you to select the proper networking interface.
show the following result on my computer #1
Code:
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ieee1394 00:90:27:00:01:b3:ae:dc brd ff:ff:ff:ff:ff:ff:ff:ff
inet 192.168.200.1/24 brd 192.168.200.255 scope global eth2
You can see that it is the IEEE1394 interface