Synopsis # This chapter covers lightweight, in-base tunneling mechanisms for pragmatic overlays and migrations: gif(4) (generic IP-in-IP), gre(4) (Generic Routing Encapsulation), and etherip(4) (Layer-2 Ethernet over IP). These interfaces interoperate well with non-OpenBSD devices and are suitable when cryptography is not required, when you must carry non-IP protocols (GRE), or when you must extend L2 domains (EtherIP). Boot-time configuration uses hostname.if(5) ; runtime management uses ifc...
