Network Topology: Internet to Mac to Router?

If one wants uses a Mac to connect to a WiFi modem, turns on Internet Sharing to share the connection over Ethernet, and then connects an Ethernet cable to a router, should the router be in bridge mode? I don't have specifics because I'm inquiring on behalf of someone else.
I was just hoping someone who knew could send a couple pointers my way.
Many thanks in advance.

In general your life will be much, much easier with fewer devices running NAT.
In most cases the router that connects to your ISP runs NAT to link the public internet to your private LAN (typically a 192.168.x.x network).
Now you're extending your network by using your Mac to link this network to another network. You do this by running NAT.
If you add a wireless access point to the internal-internal network and you set it to also run NAT you're triple-NATting your network - one NAT at your ISP's router, one NAT on the Mac and another NAT on the wireless base station. ick, ick, ick.
Given your question I would absolutely run the base station in bridge mode to act as a simple link between the wired and wireless clients. This will eliminate one level of NAT. You can do it the other way but there's absolutely no advantage and it just serves to complicate the setup.
However, I have to ask why you don't set the wireless router as the first device (connected to your ISP) and have that run a single NAT for the entire network. That would seem to be the simplest solution all around.

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