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head/share/man/man4/gre.4
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| .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | .\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||||
| .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | .\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||||
| .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | .\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||||
| .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||||
| .\" POSSIBILITY OF SUCH DAMAGE. | .\" POSSIBILITY OF SUCH DAMAGE. | ||||
| .\" | .\" | ||||
| .\" $FreeBSD$ | .\" $FreeBSD$ | ||||
| .\" | .\" | ||||
| .Dd June 29, 2020 | .Dd August 21, 2020 | ||||
| .Dt GRE 4 | .Dt GRE 4 | ||||
| .Os | .Os | ||||
| .Sh NAME | .Sh NAME | ||||
| .Nm gre | .Nm gre | ||||
| .Nd encapsulating network device | .Nd encapsulating network device | ||||
| .Sh SYNOPSIS | .Sh SYNOPSIS | ||||
| To compile the | To compile the | ||||
| driver into the kernel, place the following line in the kernel | driver into the kernel, place the following line in the kernel | ||||
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| .Nm | .Nm | ||||
| device needs a route to the decapsulating host that does not run over the tunnel, | device needs a route to the decapsulating host that does not run over the tunnel, | ||||
| as this would be a loop. | as this would be a loop. | ||||
| .Pp | .Pp | ||||
| The kernel must be set to forward datagrams by setting the | The kernel must be set to forward datagrams by setting the | ||||
| .Va net.inet.ip.forwarding | .Va net.inet.ip.forwarding | ||||
| .Xr sysctl 8 | .Xr sysctl 8 | ||||
| variable to non-zero. | variable to non-zero. | ||||
| .Pp | |||||
| By default, | |||||
| .Nm | |||||
| tunnels may not be nested. | |||||
| This behavior may be modified at runtime by setting the | |||||
| .Xr sysctl 8 | |||||
| variable | |||||
| .Va net.link.gre.max_nesting | |||||
| to the desired level of nesting. | |||||
| .Sh SEE ALSO | .Sh SEE ALSO | ||||
| .Xr gif 4 , | .Xr gif 4 , | ||||
| .Xr inet 4 , | .Xr inet 4 , | ||||
| .Xr ip 4 , | .Xr ip 4 , | ||||
| .Xr me 4 , | .Xr me 4 , | ||||
| .Xr netintro 4 , | .Xr netintro 4 , | ||||
| .Xr protocols 5 , | .Xr protocols 5 , | ||||
| .Xr ifconfig 8 , | .Xr ifconfig 8 , | ||||
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