linux 2.6.16.38 w/ vs2.0.3-rc1

[linux-2.6.git] / Documentation / networking / tuntap.txt

diff --git a/Documentation/networking/tuntap.txt b/Documentation/networking/tuntap.txt
index 839cbb7..ec3d109 100644 (file)
--- a/Documentation/networking/tuntap.txt
+++ b/Documentation/networking/tuntap.txt
@@ -39,13 +39,10 @@ Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
      mknod /dev/net/tun c 10 200
   
   Set permissions:
-     e.g. chmod 0666 /dev/net/tun
-     There's no harm in allowing the device to be accessible by non-root users,
-     since CAP_NET_ADMIN is required for creating network devices or for 
-     connecting to network devices which aren't owned by the user in question.
-     If you want to create persistent devices and give ownership of them to 
-     unprivileged users, then you need the /dev/net/tun device to be usable by
-     those users.
+     e.g. chmod 0700 /dev/net/tun
+     if you want the device only accessible by root. Giving regular users the
+     right to assign network devices is NOT a good idea. Users could assign
+     bogus network interfaces to trick firewalls or administrators.
 
   Driver module autoloading
 
@@ -141,7 +138,7 @@ This means that you have to read/write IP packets when you are using tun and
 ethernet frames when using tap.
 
 5. What is the difference between BPF and TUN/TAP driver?
-BPF is an advanced packet filter. It can be attached to existing
+BFP is an advanced packet filter. It can be attached to existing
 network interface. It does not provide a virtual network interface.
 A TUN/TAP driver does provide a virtual network interface and it is possible
 to attach BPF to this interface.