Correcting the Ethernet interface configuration

Since only one interface can be on at a time, we will set up networking as follows:

1. In the upper right-hand corner of the screen, click on the down arrow, which will provide various pieces of information about the current state of the computer. In the lower left-hand corner of that box, click on the settings icon:

1. Next to one of the interfaces, select the arrow icon, which will expose another level of menus. Click on Wired Settings:

1. Select Add Profile from the bottom:

1. From the New Profile window, select Identity on the left; and for Name, enter Host-Only Network:

1. In the left column, click on IPv4 and scroll all the way to the bottom and put a check in the box labeled Use this connection only for resources on its network, and then click on Add:

1. Assign eth1 to the host-only network that we just created by clicking on eth1 to highlight it. Click on host-only network. Verify that eth0 is assigned to the wired connection network by clicking on eth1. You should now be able to have both interfaces enabled simultaneously: