diff options
Diffstat (limited to 'share/man/man4/tap.4')
| -rw-r--r-- | share/man/man4/tap.4 | 37 |
1 files changed, 32 insertions, 5 deletions
diff --git a/share/man/man4/tap.4 b/share/man/man4/tap.4 index c82220b..98861d8 100644 --- a/share/man/man4/tap.4 +++ b/share/man/man4/tap.4 @@ -1,7 +1,7 @@ .\" $FreeBSD$ .\" Based on PR#2411 .\" -.Dd July 9, 2000 +.Dd February 4, 2007 .Os .Dt TAP 4 .Sh NAME @@ -41,11 +41,26 @@ The network interfaces are named etc., one for each control device that has been opened. These Ethernet network interfaces persist until .Pa if_tap.ko -module is unloaded (if +module is unloaded, or until removed with "ifconfig destroy" (see below). +.Pp +.Nm +devices are created using interface cloning. +This is done using the +.Dq ifconfig tap Ns Sy N No create +command. +This is the preferred method of creating .Nm -is built into your kernel, the network interfaces cannot be removed). +devices. +The same method allows removal of interfaces. +For this, use the +.Dq ifconfig tap Ns Sy N No destroy +command. .Pp -The +If the +.Xr sysctl 8 +variable +.Va net.link.tap.devfs_cloning +is non-zero, the .Nm interface permits opens on the special control device @@ -57,9 +72,21 @@ will return a handle for the lowest unused device (use .Xr devname 3 to determine which). +.Pp +.Bf Em +Disabling the legacy devfs cloning functionality may break existing +applications which use +.Nm , +such as +.Tn VMware +and +.Xr ssh 1 . +It therefore defaults to being enabled until further notice. +.Ef +.Pp Control devices (once successfully opened) persist until .Pa if_tap.ko -is unloaded in the same way that network interfaces persist (see above). +is unloaded or the interface is destroyed. .Pp Each interface supports the usual Ethernet network interface .Xr ioctl 2 Ns s , |
