Tuesday, April 9, 2019

2019 openvpn Differences between TUN and TAP

The differences between this setup and the Server-side routing recipe of the pre-
vious chapter are minimal. There are a few subtle differences, however, which can
lead to unforeseen effects if you are not aware of them:

•When using a TAP adapter, the full Ethernet frame is encapsulated. This caus-
es a slightly larger overhead.
•All the machines that are connected to a TAP-style network form a single
broadcast domain. The effects of this will become clearer in the next recipe.
•If bridging is needed, a TAP-style tunnel is required.

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