Can't share internet (via ethernet) with 2 Mac Pros

I've got 2 Mac Pros, but only one cable from my cable modem. (I'm aware I could get a router, but I don't want to do that yet.) So I've got ethernet going from cable modem to Mac Pro 1 (MP1) into its ethernet 1 port and it works perfectly.
Now I'd like to use MP1's ethernet 2 port to share internet with MP2. I can't get it to work.
Settings: on MP1, in System Prefs > Sharing > Internet Sharing, I have it enabled, and set to "Share your connection from Ethernet 1 to computers using Ethernet 2"
On MP2, it's set to DHCP. But internet doesn't work on it.
I can use file sharing to connect from MP1 to MP2 (or vice versa) so the ethernet cable is good. I can transfer files back and forth. But if I launch Safari on MP2, it won't pull down any web pages.
Strange thing: on MP1, in System Prefs > Network, ethernet 1 has a green light and shows connected (that's OK). But ethernet 2 shows a yellow light, says "self-assigned IP", and configure IPv4 is set to "Using DHCP" and the IP address is 169.254.xxx.xx. I'm suspicious that this starts with 169, since I think that means it's not working. Also if I look on MP2, its IP address is 192.168.2.xx.
Can anyone help me get internet working on MP2?

Helpful, but still not working.
On the first Mac Pro (MP1, the one connected to the cable modem), Ethernet 1 is connected to the cable modem, and it has an IP of 192.168.2.100, subnet mask of 255.255.255.0. It works perfectly.
On the first Mac Pro if I go to the Ethernet 2 tab, I'm not sure what to fill in. You said not to use DHCP? So I tried Manually, giving the IP 192.168.2.102, subnet mask 255.255.255.0, and leaving router, DNS server, and search domains blank, as you suggested.
On the second Mac Pro (the "slave"), I set it to "Using DHCP" but (mysteriously) it assigns itself an IP address of 192.168.2.3. It does grab the subnet mask and router automatically. Communication between MP1 and MP2 works (I can log into one from the other), but internet does not. It's like it's partially working. I tried DHCP with manual IP, giving it the same IP (192.168.2.3) but then it says that IP is in use.
Did I do it right? On MP1, Ethernet 2, should I be configuring things manually? (I've tried DHCP too, and that doesn't work: MP1 shows an IP of 169.254.213.35 and MP2, set to DHCP, shows a different IP of 169.254.161.138.)

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Message was edited by: Velkey-Solvberg

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