Naming networkinterfaces using udev

Latest revision as of 17:04, 19 January 2012

[edit] Naming networkinterfaces using udev

Usually the robots are configured to use DHCP at networkinterface 'eth0' and have a static IP (10.0.1.2) at interface 'eth1'. In order to get the wireless PCMCIA netcard to use DHCP we want to rename it to 'eth0'. This can be achieved by using the udev system. Changes are done in the file

/etc/udev/rules.d/75-network-devices.rules

Add the following two lines:

SUBSYSTEMS=="pci", DRIVERS=="via-rhine", NAME="eth1"
SUBSYSTEMS=="pci", DRIVERS=="yenta_cardbus", NAME="eth0"

Remove any conflicting lines.

[edit] Jetway Atom boards

The approach above will work on the VIA based motherboards used at the SMRs. The new Intel Atom based motherborads from Jetway uses a Realtek network controller. Therefore change the line

SUBSYSTEMS=="pci", DRIVERS=="via-rhine", NAME="eth1"

to

SUBSYSTEMS=="pci", DRIVERS=="r8168", NAME="eth1"

to achieve the same on the Jetway motherboards.

[edit] Further information

To find the information available for the different networkinterfaces (and all other devices) use "udevinfo". For 'eth0' execute the following command:

udevinfo -a -p /sys/class/net/eth0

on newer systems (ubuntu 11.10) use

udevadm info -a -p /sys/class/net/eth0

All devices available on the system are found in the '/sys' file system, and can be listed using "udevinfo". All udev rules are found in

/etc/udev/rules.d

The files in this directory are parsed in lexical order.