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share/man/man4/inet6.4
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||||
.\" 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. | ||||
.\" | .\" | ||||
.\" $FreeBSD$ | .\" $FreeBSD$ | ||||
.\" | .\" | ||||
.Dd November 25, 2020 | .Dd November 9, 2021 | ||||
.Dt INET6 4 | .Dt INET6 4 | ||||
.Os | .Os | ||||
.Sh NAME | .Sh NAME | ||||
.Nm inet6 | .Nm inet6 | ||||
.Nd Internet protocol version 6 family | .Nd Internet protocol version 6 family | ||||
.Sh SYNOPSIS | .Sh SYNOPSIS | ||||
.In sys/types.h | .In sys/types.h | ||||
.In netinet/in.h | .In netinet/in.h | ||||
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.It Dv IPV6CTL_V6ONLY | .It Dv IPV6CTL_V6ONLY | ||||
.Pq ip6.v6only | .Pq ip6.v6only | ||||
Boolean: enable/disable the prohibited use of | Boolean: enable/disable the prohibited use of | ||||
.Tn IPv4 | .Tn IPv4 | ||||
mapped address on | mapped address on | ||||
.Dv AF_INET6 | .Dv AF_INET6 | ||||
sockets. | sockets. | ||||
Defaults to on. | Defaults to on. | ||||
.It Va ip6.source_address_validation | |||||
Boolean: perform source address validation for packets destined for the local | |||||
host. | |||||
Consider this as following Section 3.2 of RFC3704/BCP84, where we treat local | |||||
host as our own infrastructure. | |||||
This has no effect on packets to be forwarded, so don't consider it as | |||||
anti-spoof feature for a router. | |||||
Enabled by default. | |||||
.El | .El | ||||
.Ss Interaction between IPv4/v6 sockets | .Ss Interaction between IPv4/v6 sockets | ||||
By default, | By default, | ||||
.Fx | .Fx | ||||
does not route IPv4 traffic to | does not route IPv4 traffic to | ||||
.Dv AF_INET6 | .Dv AF_INET6 | ||||
sockets. | sockets. | ||||
The default behavior intentionally violates RFC2553 for security reasons. | The default behavior intentionally violates RFC2553 for security reasons. | ||||
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