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head/share/man/man4/carp.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 February 21, 2013 | .Dd May 7, 2018 | ||||
| .Dt CARP 4 | .Dt CARP 4 | ||||
| .Os | .Os | ||||
| .Sh NAME | .Sh NAME | ||||
| .Nm carp | .Nm carp | ||||
| .Nd Common Address Redundancy Protocol | .Nd Common Address Redundancy Protocol | ||||
| .Sh SYNOPSIS | .Sh SYNOPSIS | ||||
| .Cd "device carp" | .Cd "device carp" | ||||
| .Sh DESCRIPTION | .Sh DESCRIPTION | ||||
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| cryptographic checksum supplied in each advertisement. | cryptographic checksum supplied in each advertisement. | ||||
| Multiple vhids running on one interface participate in master/backup | Multiple vhids running on one interface participate in master/backup | ||||
| elections independently. | elections independently. | ||||
| .Pp | .Pp | ||||
| Additionally, there are a number of global parameters which can be set using | Additionally, there are a number of global parameters which can be set using | ||||
| .Xr sysctl 8 : | .Xr sysctl 8 : | ||||
| .Bl -tag -width ".Va net.inet.carp.ifdown_demotion_factor" | .Bl -tag -width ".Va net.inet.carp.ifdown_demotion_factor" | ||||
| .It Va net.inet.carp.allow | .It Va net.inet.carp.allow | ||||
| Accept incoming | Allow | ||||
| .Nm | .Nm | ||||
| packets. | operation. | ||||
| When disabled, virtual hosts remain in initial state, neither sending nor | |||||
| receiving announcements or traffic. | |||||
| Enabled by default. | Enabled by default. | ||||
| .It Va net.inet.carp.preempt | .It Va net.inet.carp.preempt | ||||
| Allow virtual hosts to preempt each other. | Allow virtual hosts to preempt each other. | ||||
| When enabled, a vhid in a backup state would preempt a master that | When enabled, a vhid in a backup state would preempt a master that | ||||
| is announcing itself with a lower advskew. | is announcing itself with a lower advskew. | ||||
| Disabled by default. | Disabled by default. | ||||
| .It Va net.inet.carp.log | .It Va net.inet.carp.log | ||||
| Determines what events relating to | Determines what events relating to | ||||
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