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I have a computer with two Ethernet ports and a Wireless adapter.

How do I share its Internet connection (connected to one Ethernet port) to both the Ethernet LAN and via Wi-Fi? I don't want to use a router.

For some reason the Wi-Fi interface doesn't have "Bridge" in its right-click menu. Perhaps I could set up NAT using the netsh and route commands?

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I would strongly advise you to just spend to $30 to get a wireless router. Desktops make lousy routers when they're also being used as desktops. (Also, the answer depends on precisely what that Ethernet port is connected to. For example, is it a router? A modem with a built-in router? A modem without a built-in router that is just bridging?) – David Schwartz Dec 11 '12 at 2:30
It's more of a server/workstation computer, so it's always-on. – Vladimir Panteleev Dec 11 '12 at 2:39
What does that Ethernet port connect to? – David Schwartz Dec 11 '12 at 2:40
The home LAN connection goes to a gigabit switch. The Internet goes directly to the ISP's router. – Vladimir Panteleev Dec 11 '12 at 2:40
I'm really more interested if it's possible to do in software (Windows 7). I think it's possible e.g. by bridging the local interfaces then NAT-ing that, or by manually setting up routing tables. Maybe that's outside the scope of this SE site. – Vladimir Panteleev Dec 11 '12 at 2:42
up vote 0 down vote accepted

I noticed that Connectify Hotspot was able to set up a NAT-ed Wi-Fi hotspot without changing the Internet Connection Sharing setting.

I'll update this answer after I try to connect the Ethernet LAN as well.

Edit: it worked.

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