Chris Tyler - Fedora Linux

A router passes packets from one interface to another, and Fedora is capable of doing this. /proc/sys/net/ipv4/ip_forward controls packet forwarding; writing a 1 to this path enables forwarding:

# echo 1 >/proc/sys/net/ipv4/ip_forward

Likewise, writing a 0 disables forwarding:

# echo 0 >/proc/sys/net/ipv4/ip_forward

The ifrename utility can be used to rename a network interface. The -i option specifies the old interface name, and -n sets the new name. To rename wlan0 to eth1 , for example:

# ifrename -i wlan0 -n eth1

eth1

# ifconfig wlan0

wlan0: error fetching interface information: Device not found

# ifconfig eth1

eth1 Link encap:Ethernet HWaddr 00:0C:2D:00:2B:DB

BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

The GUI network configuration program ( system-config-network ) will sometimes refuse to configure interfaces that start with wlan ; after renaming the interface, you can use the GUI configuration tool to permanently set up the interface.

 The manpages for ifconfig , route , netstat , iwconfig , iwlist , resolver , resolv.conf , hosts , dhclient , NetworkManager , NetworkManagerDispatcher , nm-applet , nm-tool , and modprobe .

 The home pages for wireless firmware projects on SourceForge, including http://ipw2100.sf.net/ , http://ipw2200.sourceforge.net/ , http://ipw3945.sf.net/ , and http://linux-lc100020.sourceforge.net/

 RFC1918, Address Allocation for Private Internets: http://tools.ietf.org/html/1918

 Documentation on the files in /etc/sysconfig : /usr/share/doc/initscripts*/sysconfig.txt

Many laptops use a Synaptics TouchPad (or an Alps GlidePoint, which can use the same driver). By default, a touchpad will emulate a PS/2 mouse, so it should work fine with the default driver, but if you use the Synaptics-specific driver, you can exquisitely fine-tune the touchpad's extended features.

You will need to manually edit the X server configuration file, /etc/X11/ xorg.conf , to make two changes.

It's a good idea to get into the habit of making a backup of configuration files before modifying them, just in case something goes wrong:

# cp /etc/X11/Xorg.conf /etc/X11/Xorg.conf.backup

First, add an InputDevice line to the ServerLayout section:

Section "ServerLayout"

Identifier "Default Layout"

Screen 0 "Screen0" 0 0

InputDevice "Mouse0" "CorePointer"

InputDevice "TouchPad0" "AlwaysCore"

InputDevice "Keyboard0" "CoreKeyboard"

EndSection

Next, add a new InputDevice section (you can add this to any part of the file that is not between Section and EndSection lines):

Section "InputDevice"

Identifier "Touchpad0"

Driver "synaptics"

Option "SHMConfig" "on"

EndSection

When you restart the X server by restarting the system or pressing Ctrl-Alt-Backspace (save any work first!), the Synaptics driver will be loaded with a default configuration that will permit you to:

 Click the left mouse button by tapping one finger in the middle area or by tapping the upper-left corner.

 Drag with the left mouse button by tapping and then dragging one finger (touch-release-touch, then drag).

 Click the middle mouse button by tapping two fingers in the middle area or by tapping the upper-right corner (this will usually perform a fast-paste of selected text).

 Click the right mouse button by tapping three fingers in the middle area or by tapping the lower-right corner.

 Scroll up and down by running your finger up and down the right side (if supported by your application).

 Scroll left and right by running your finger across the bottom (if supported by your application). Some web browsers, such as Firefox, use this for history navigation (left for previous page, right for next page).

These default options work well for most users, but the driver is incredibly customizable. It's also one of the few X drivers that can be adjusted without restarting the X server, through the use of the synclient program.

Running synclient with the -l option will list the current driver settings:

$ synclient -l

Parameter settings:

LeftEdge = 1900

RightEdge = 5400

TopEdge = 1900

BottomEdge = 4000

FingerLow = 25

FingerHigh = 30

MaxTapTime = 180

MaxTapMove = 220

MaxDoubleTapTime = 180

ClickTime = 100

FastTaps = 0

EmulateMidButtonTime = 75

VertScrollDelta = 100

HorizScrollDelta = 100

MinSpeed = 0.09

MaxSpeed = 0.18

AccelFactor = 0.0015

EdgeMotionMinZ = 30

EdgeMotionMaxZ = 160

EdgeMotionMinSpeed = 1

EdgeMotionMaxSpeed = 400

EdgeMotionUseAlways = 0

UpDownScrolling = 1

LeftRightScrolling = 1

UpDownRepeat = 1

LeftRightRepeat = 1

ScrollButtonRepeat = 100

TouchpadOff = 0

GuestMouseOff = 0

LockedDrags = 0

RTCornerButton = 2

RBCornerButton = 3

LTCornerButton = 0

LBCornerButton = 0

TapButton1 = 1

TapButton2 = 2

TapButton3 = 3

CircularScrolling = 0

CircScrollDelta = 0.1

CircScrollTrigger = 0

CircularPad = 0

PalmDetect = 1

PalmMinWidth = 10

PalmMinZ = 200

CoastingSpeed = 0

These parameters are fully explained in the manpage for synaptics , but the most commonly altered values are described in Table 3-3 .

Table 3-3. Commonly altered Synaptics driver values

To test an option value, use the synclient program: