Please understand that in both setups, **basic networking knowledge is a must**. You do need to understand basic network *routing* and *firewalling*, no matter if you use routing, bridging, TUN or TAP. Both TUN and TAP devices supports traditional network routing, so you are not required to use bridging with TAP. But using bridges, you need in addition to know how bridges work and how this changes your firewalling. To say it simple: Bridging will complicate your setup further. Of course, there are scenarios where bridging really is the right solution. But in most cases you will most likely solve your VPN setup with basic routing.
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For more information about TCP/IP networking, the [http://www.redbooks.ibm.com/redbooks/pdfs/gg243376.pdf TCP/IP Tutorial and Technical Overview] (IBM Red Book) is recommended reading, especially chapter 3.1.
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For more information about TCP/IP networking, the [TCP/IP Tutorial and Technical Overview](http://www.redbooks.ibm.com/redbooks/pdfs/gg243376.pdf) (IBM Red Book) is recommended reading, especially chapter 3.1.
# Using routing
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To set up a TUN setup with routing and masquerading for the VPN subnet, one approach could be something like this. This example is based on a pretty standard network with a single Linux based firewall with two Ethernet cards:
