Disable IPv6 in Fedora 15

1. Create disable-ipv6.conf file and add the following line:
vim /etc/modprobe.d/disable-ipv6.conf
options ipv6 disable=1

2. Disable ip6tables
service ip6tables stop
chkconfig ip6tables off

Restart your machine

Control USB access to you Linux using udev (tested on Fedora 15)

With help of udev we can control USB bus on our machine, which devices can be plugged, which cannot.
Using this rule we only allow two USB flash devices.

#Authorized USB Devices
#1.Corsair Flash Voyager 8Gb
SUBSYSTEMS=="usb", ATTRS{serial}=="AA04012123017226", NAME="Authorized USB Device", GOTO="Exit"

#2. Transcend StoreJet 25F 320Gb
SUBSYSTEMS=="usb", ATTRS{serial}=="31341B14112C", NAME="Authorized USB Device", GOTO="Exit"

##Unauthorized USB Devices
SUBSYSTEMS=="usb", ATTRS{serial}==".*", GOTO="Block Unauthorized USB Devices"

##Block unauthorzed USB Devices
LABEL="Block Unauthorized USB Devices"
DRIVERS=="usb", OPTIONS+="ignore_device"

##Exit for authorized
LABEL="Exit"

#gather info:     udevadm info -a -p /sys/block/sdb
#test your rules: udevadm test /sys/devices/....
#todo: logging (usb serial number)
#