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$FreeBSD$
.Dd November 7, 2014 .Dt ME 4 .Os .Sh NAME .Nm me .Nd encapsulating network device .Sh SYNOPSIS To compile the driver into the kernel, place the following line in the kernel configuration file: d -ragged -offset indent .Cd "device me" .Ed
p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -literal -offset indent if_me_load="YES" .Ed .Sh DESCRIPTION The .Nm network interface pseudo device encapsulates datagrams into IP. These encapsulated datagrams are routed to a destination host, where they are decapsulated and further routed to their final destination.
p .Nm interfaces are dynamically created and destroyed with the .Xr ifconfig 8 .Cm create and .Cm destroy subcommands.
p This driver corresponds to RFC 2004. Datagrams are encapsulated into IP with a shorter encapsulation. The original IP header is modified and the modifications are inserted between the so modified header and the original payload. The protocol number 55 is used for outer header. .Sh NOTES For correct operation, the .Nm device needs a route to the decapsulating host that does not run over the tunnel, as this would be a loop. .Sh SEE ALSO .Xr gif 4 , .Xr gre 4 , .Xr inet 4 , .Xr ip 4 , .Xr netintro 4 , .Xr protocols 5 , .Xr ifconfig 8 , .Xr sysctl 8 .Sh AUTHORS .An Andrey V. Elsukov Aq Mt ae@FreeBSD.org