The laptop runs Debian Jessie. I have set up Ethernet with manual IP to talk to the Pi. Wifi connects via DHCP to my local router and Internet. When Ethernet is unplugged, all is fine, I can browse the Internet through the Wifi. Now when I connect the Ethernet, somehow the Wifi is "overriden", i.e. the system (e.g. browser) only seems to try to connect to the Internet through the Ethernet and doesn't care about the Wifi.
Can I keep browsing the Internet from the laptop with the Wifi while talking to the Pi on Ethernet? Note: I'm not interested in connecting the Pi to the Internet, I simply want to avoid that I cannot browse while connected to the Pi.