| tun.4 (163175) | tun.4 (166497) |
|---|---|
| 1.\" $NetBSD: tun.4,v 1.1 1996/06/25 22:17:37 pk Exp $ | 1.\" $NetBSD: tun.4,v 1.1 1996/06/25 22:17:37 pk Exp $ |
| 2.\" $FreeBSD: head/share/man/man4/tun.4 163175 2006-10-09 19:53:00Z trhodes $ | 2.\" $FreeBSD: head/share/man/man4/tun.4 166497 2007-02-04 16:32:46Z bms $ |
| 3.\" Based on PR#2411 4.\" | 3.\" Based on PR#2411 4.\" |
| 5.Dd October 9, 2006 | 5.Dd February 4, 2007 |
| 6.Dt TUN 4 7.Os 8.Sh NAME 9.Nm tun 10.Nd tunnel software network interface 11.Sh SYNOPSIS 12.Cd device tun 13.Sh DESCRIPTION --- 23 unchanged lines hidden (view full) --- 37interface. 38.Pp 39The network interfaces are named 40.Dq Li tun0 , 41.Dq Li tun1 , 42etc., one for each control device that has been opened. 43These network interfaces persist until the 44.Pa if_tun.ko | 6.Dt TUN 4 7.Os 8.Sh NAME 9.Nm tun 10.Nd tunnel software network interface 11.Sh SYNOPSIS 12.Cd device tun 13.Sh DESCRIPTION --- 23 unchanged lines hidden (view full) --- 37interface. 38.Pp 39The network interfaces are named 40.Dq Li tun0 , 41.Dq Li tun1 , 42etc., one for each control device that has been opened. 43These network interfaces persist until the 44.Pa if_tun.ko |
| 45module is unloaded (if | 45module is unloaded, or until removed with the 46.Xr ifconfig 8 47command. 48.Pp |
| 46.Nm | 49.Nm |
| 47is built into your kernel, the network interfaces cannot be removed). | 50devices are created using interface cloning. 51This is done using the 52.Dq ifconfig tap Ns Sy N No create 53command. 54This is the preferred method of creating 55.Nm 56devices. 57The same method allows removal of interfaces. 58For this, use the 59.Dq ifconfig tap Ns Sy N No destroy 60command. |
| 48.Pp | 61.Pp |
| 49The | 62If the 63.Xr sysctl 8 64variable 65.Va net.link.tun.devfs_cloning 66is non-zero, the |
| 50.Nm 51interface 52permits opens on the special control device 53.Pa /dev/tun . 54When this device is opened, 55.Nm 56will return a handle for the lowest unused 57.Nm 58device (use 59.Xr devname 3 60to determine which). | 67.Nm 68interface 69permits opens on the special control device 70.Pa /dev/tun . 71When this device is opened, 72.Nm 73will return a handle for the lowest unused 74.Nm 75device (use 76.Xr devname 3 77to determine which). |
| 78.Pp 79.Bf Em 80Disabling the legacy devfs cloning functionality may break existing 81applications which use 82.Nm , 83such as 84.Xr ppp 8 85and 86.Xr ssh 1 . 87It therefore defaults to being enabled until further notice. 88.Ef 89.Pp |
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| 61Control devices (once successfully opened) persist until 62.Pa if_tun.ko 63is unloaded in the same way that network interfaces persist (see above). 64.Pp 65Each interface supports the usual network-interface 66.Xr ioctl 2 Ns s , 67such as 68.Dv SIOCAIFADDR --- 216 unchanged lines hidden --- | 90Control devices (once successfully opened) persist until 91.Pa if_tun.ko 92is unloaded in the same way that network interfaces persist (see above). 93.Pp 94Each interface supports the usual network-interface 95.Xr ioctl 2 Ns s , 96such as 97.Dv SIOCAIFADDR --- 216 unchanged lines hidden --- |