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What Can You Do With A Second Linux Server Ethernet port?

Nathan has published an interesting article at Linux.com about second Ethernet port:

Purchase a new PC or motherboard soon, and the chances are good that it will come with two built-in network interfaces -- either two Ethernet jacks or one Ethernet and one Wi-Fi. Tossing in a second adapter is an inexpensive way for the manufacturer to add another bullet point to the product description -- but what exactly are you supposed to do with it? If you are running Linux, you have several alternatives.

My second Ethernet port usage

What's your second Ethernet port usage?