simple vxlan implementation with tap interface.


ex.1)

+--------+
|   VM   |
|vvvvvvvv|                     
| eth0 A |                 ******************
|~~~~~~~~| +---------+     *                *      +---------+
+ vnet0  + |  vxlan  | +--------+       +--------+ |  vxlan  |
|^^^^^^^^| |^^^^^^^^^| |  eth0  |       |  eth0  | |^^^^^^^^^|
|        br0 B       | |   L3   |       |   L3   | |  br0 C  |
+====================+==========+       +====================+
|             (KVM)             |       |     Linux Box      |
+-------------------------------+       +--------------------+




ex.2)

                              +------------+
                              | 172.16.2.1 |
+------------+ +------------+ |    br102   |
| 172.16.0.1 | | 172.16.1.1 | |~~~~~~~~~~~~|
| vxlan.100  | | vxlan.101  | | vxlan.102  |
|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|
|                  vxlan                   |
+==========================================+---------------+
|                 host A                   | eth0 10.0.0.1 |
+==========================================+---------------+
                                                   *
                                                   *
                                                   *
                                                   *
                              +------------+       *
                              | 172.16.2.2 |       *
+------------+ +------------+ |    br102   |       *
| 172.16.0.2 | | 172.16.1.2 | |^^^^^^^^^^^^|       *
| vxlan.100  | | vlxna.101  | | vxlan.102  |       *
|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|       *
|                  vxlan                   |       *
+==========================================+---------------+
|                  host B                  | eth0 10.0.0.2 |
+==========================================+---------------+