Virtual Private Ethernet
yoggy's diary経由。これもおもしろそう。これやSoftEtherも全然さわれていないのでダメダメなんですが、メモ。ソースとCygwin, Linux, darwin, FreeBSD, NetBSD, OpenBSDのバイナリがあります。
VPE creates a virtual ethernet (broadcasts supported, any protocol that works with a normal ethernet should work with VPE) by creating host-to-host tunnels between multiple endpoints.