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share/man/man4/udp.4
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||||||||
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||||||||
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||||||||
.\" SUCH DAMAGE. | .\" SUCH DAMAGE. | ||||||||
.\" | .\" | ||||||||
.\" @(#)udp.4 8.1 (Berkeley) 6/5/93 | .\" @(#)udp.4 8.1 (Berkeley) 6/5/93 | ||||||||
.\" $FreeBSD$ | .\" $FreeBSD$ | ||||||||
.\" | .\" | ||||||||
.Dd July 20, 2022 | .Dd August 1, 2022 | ||||||||
.Dt UDP 4 | .Dt UDP 4 | ||||||||
.Os | .Os | ||||||||
.Sh NAME | .Sh NAME | ||||||||
.Nm udp | .Nm udp | ||||||||
.Nd Internet User Datagram Protocol | .Nd Internet User Datagram Protocol | ||||||||
.Sh SYNOPSIS | .Sh SYNOPSIS | ||||||||
.In sys/types.h | .In sys/types.h | ||||||||
.In sys/socket.h | .In sys/socket.h | ||||||||
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level to encapsulate | level to encapsulate | ||||||||
.Tn ESP | .Tn ESP | ||||||||
packets in | packets in | ||||||||
.Tn UDP . | .Tn UDP . | ||||||||
Only one value is supported for this option: | Only one value is supported for this option: | ||||||||
.Tn UDP_ENCAP_ESPINUDP | .Tn UDP_ENCAP_ESPINUDP | ||||||||
from RFC 3948, defined in | from RFC 3948, defined in | ||||||||
.In netinet/udp.h . | .In netinet/udp.h . | ||||||||
.Sh MIB VARIABLES | .Sh MIB (sysctl) Variables | ||||||||
The | The | ||||||||
.Nm | .Nm | ||||||||
protocol implements a number of variables in the | protocol implements a number of variables in the | ||||||||
.Va net.inet.udp | .Va net.inet.udp | ||||||||
branch of the | branch of the | ||||||||
.Xr sysctl 3 | .Xr sysctl 3 | ||||||||
MIB: | MIB, which can be also read or modified with | ||||||||
.Xr sysctl 8 : | |||||||||
pauamma_gundo.comUnsubmitted Done Inline Actions
pauamma_gundo.com: | |||||||||
.Bl -tag -width ".Va log_in_vain" | .Bl -tag -width ".Va log_in_vain" | ||||||||
.It Va blackhole | .It Va blackhole | ||||||||
When a datagram is received on a port where there is no socket | When a datagram is received on a port where there is no socket | ||||||||
listening, do not return an ICMP port unreachable message. | listening, do not return an ICMP port unreachable message. | ||||||||
(Disabled by default. | (Disabled by default. | ||||||||
See | See | ||||||||
.Xr blackhole 4 . ) | .Xr blackhole 4 . ) | ||||||||
.It Va checksum | .It Va checksum | ||||||||
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