- On your computer
Configure an ethernet connection to be "Shared to other computers."
Then, run sudo ifconfig eth0:1 192.168.1.200
(make sure that your IP address does not conflict with somebody else's).
- On sub
sudo route del default dev em1
sudo ifconfig em1:1 10.42.0.2 # should match the subnet of eth0 on your computer
sudo route add default gw 10.42.0.1 dev em1:1