"Internet Sharing" via "Ethernet" is not working
Apple Network Sharing is very unreliable across different OS and different network channels. I've lost a lot of time on this. Enough so that I'd suggest getting a simple good quality router and setting it up to pick up the wifi ethernet and redistribute it via ethernet. Make sure to set the access point router to act as a bridge (i.e. it would continue to obtain DHCP addresses from the central router). That way you can share to other devices on the master network.
You may find you get faster and more reliable internet on your MacBook Pro as well as the aluminum hulls are not particularly reception friendly, especially in comparison with a router with proper antennas which can be positioned as you like.
I'm doing something similar but using powerline adapters (more reliable than wifi) to bring the internet to the access point router.
I don't know if this will work universally, however I solved the problem in the following way.
On Mac OS X Machine
- Ethernet -> Configure IP v4 OFF
- Wifi connected to AP with relevant settings
- Sharing -> Internet sharing ON WIFI to ETHERNET
- Terminal ->
ifconfig-> Should now see "bridge100" device, with address something like192.168.2.1, probably not particularly relevant since this is self assigned by OS X
On Linux Machine
- Configure ethernet, leave in DHCP mode
Should just work. Issue for me was that I left the ethernet connection with a DHCP assigned IPv4 under 'network settings', rather than disabling it. For some reason that interferes with the settings from 'sharing'. I guess because the OS tries to assign values for 2 different interfaces on the same ethernet device. Disabling IPv4 configuration in 'Network' fixed the issue. This may not work for everyone, as others may have a different underlying problem.