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I've set up my pi as a wireless hotspot and am trying to share my Mac's internet via ethernet.
The hotspot side of things works ok and if I have my mac's wifi (or even internet sharing) turned off I can ping and ssh with the Pi via ethernet.
As soon as I enable internet sharing on the mac, I lose the ethernet connection.
Anyone any ideas?
If you have internet sharing turned off, and things work, that implies that either you have set up static IPs, or you are running a DHCP server on the pi side of the ethernet. I'm guessing the latter. If you share your mac's wifi connection over ethernet, the mac will be expecting to act as a DHCP server, not a client.
Either way, your pi is now sitting there as either a static IP or a DHCP server, but definitely not a DHCP client, which is why it's not working. You need to reconfigure your eth0 to be a DHCP client. You need
iface eth0 inet dhcp
in /etc/network/interfaces
You likely have
iface eth0 inet static
which won't work in this case.
