Partial VPN
Blackhole enables you to tunnel raw Ethernet through a socket connection.
Normal Ethernet Cable:
+---------+ +--------+
| Switch | <---------- Cable --------------> | Switch |
+---------+ +--------+
Blackhole:
+--------+ +----------------------------+ +----------------------------+ +--------+
| Switch | <-----> | eth0 Blackhole Server eth1 | <---- Internet ----> | eth1 Blackhole Client eth0 | <-----> | Switch |
+--------+ +----------------------------+ +----------------------------+ +--------+
eth0 is configured without an ip or other layer 3 protocol. (Only Layer 2 should be configured) eth1 is configured to enable normal tcp ip traffik.
With blackhole the network is tunneled through a TCP Ip connection to share a network over the Internet.