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Absolute OpenBSD, 2nd Edition by Michael W. Lucas

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VLANs

VLANs are a way to get multiple Ethernet segments on a single piece of wire. You’ll sometimes see this referred to as 802.1q, tagging, or a combination of these terms.

In OpenBSD terms, one wire can carry multiple networks, and by configuring an additional interface, you can talk to those additional networks as if they had their own private wire. The wire can still carry only so much data, however, so all VLANs and the regular network (or native VLAN) that share the wire share the same pool of bandwidth.

VLAN frames that arrive at your network card are like regular Ethernet frames, with an additional header before the Ethernet frame that says “This is part of VLAN number such-and-such.” Each VLAN is identified by a number. VLAN number 1 ...

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