Can't Share Internet Connection
My iMac is connected to the internet via a wi-fi modem/router. I have had a Mac Pro and an internet-enabled (for captions) telephone connected to the iMac via an ethernet splitter, and each has had a perfect internet connection for months. All I ever did to make it work was turn on Internet Sharing in the the Sharing Pane of System Preferences on the iMac.
I've now retired the Mac Pro and have connected the phone directly to the iMac and just noticed that it doesn't have an internet connection. The reason is that, in the Network Pane of System Preferences, I see "Ethernet has a self-assigned IP address and will not be able to connect to the Internet."
I've restarted the router, the iMac and the telephone but always ethernet gets a self-assigned IP address, and the phone doesn't see an internet connection. I also reinserted the ethernet splitter between the iMac and the phone but that made no difference and I've removed it again.
Does anyone have any idea why this has suddenly broken after working for months and, more importantly, how to fix it?
Thanks in advance,
Steve = : ^ )
iMac, macOS Sierra (10.12.1), Windows XP & 8.1 in Parallels 12