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| Virtual Networking |
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Page 3 of 5
Same as 2) except the QEMU guests are on a Virtual Network on another physical machine which is, in turn, connected to the Virtual Network on the first physical machine
+-----------+ D +-----------+
| Guest | N D H | Guest |
| A | A N C | B |
| +---+ | T S P | +---+ |
| |NIC| | ^ ^ ^ | |NIC| |
+---+-+-+---+ +---+---+ +---+-+-+---+
^ | ^
| +--------+ +---+---+ +--------+ |
+-->+ vif1.0 +----+ vnbr0 +----+ vif2.0 +<--+
+--------+ +---+---+ +--------+
|
+---+---+
| vtap0 |
+---+---+
|
+--+--+
| VDE |
+--+--+
|
First Physical Machine V
-------------------------------------------------------------
Second Physical Machine ^
|
+-------+ +--+--+ +-------+
+---->+ VLAN0 +----+ VDE +---+ VLAN0 +<-----+
| +-------+ +-----+ +-------+ |
V V
+---+-+-+---+ +---+-+-+---+
| |NIC| | | |NIC| |
| +---+ | | +---+ |
| Guest | | Guest |
| C | | D |
+-----------+ +-----------+
Notes:
- What's going on here is that the two VDEs are connected over the network, either via a plan socket or perhaps encapsulated in another protocol like SSH or TLS
One interesting thing to note from all of those examples is that although QEMU's networking options are very interesting, it doesn't actually make sense for a network to be implemented inside a guest. The network needs to be external to any guests, and so we use VDE to offer similar networking options to the ones QEMU provides. All QEMU needs to be able to do is to connect to VDE.
