Network profiles

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By creating network profiles, you can easily select different network configurations at boot or at run time from the console.

Setting up the profiles

As root: Duplicate the sample profile at /etc/network-profiles/, and save it as a describing name:

cd /etc/network-profiles
cp ./template home

Now edit this new profile (e.g. home) in your favorite editor (i.e. emacs) to fit your needs. Below is a very simple profile example to connect to a wireless network. Using the profile below is equal to using:

iwconfig eth1 essid home_wlan key F4DE214AA8
dhcpcd -s 192.168.1.105 eth1

And here the profile script:

DESCRIPTION="Wireless profile at home"

# Network Settings
INTERFACE=eth1
HOSTNAME=myhost

# Interface Settings (use IFOPTS="dhcp" for DHCP)
IFOPTS="dhcp"

# Wireless Settings (optional)
ESSID=home_wlan
KEY=F4DE214AA8
IWOPTS="essid $ESSID key $KEY"
DHCPCD_ARGS="-s 192.168.1.105"

Create as many different profiles as you need.

Last, be sure to comment out any entry in your rc.conf related to network interfaces other than "lo": the lines with eth0="", gateway="" and ROUTES=() should be commented, while:

INTERFACES=(lo)

Select profile at boot time using GRUB

Selecting a certain profile at boot time is handy, and is easily accomplished using GRUB. Edit the /boot/grub/menu.lst, duplicate your standard boot section and add NET=<profile name> to the kernel line e.g:

# (0) Arch Linux
title  Arch Linux (Standard) [/boot/vmlinuz26]
root   (hd0,0)
kernel /vmlinuz26 root=/dev/sda3 ro vga=794
initrd /kernel26.img 

# (1) Arch Linux
title  Arch Linux (Wireless at home) [/boot/vmlinuz26]
root   (hd0,0)
kernel /vmlinuz26 root=/dev/sda3 ro vga=794 NET=home
initrd /kernel26.img

Select profile at boot time using dialog

You can select network profile using the dialog package. Simply edit /etc/rc.conf file and comment out the line:

NET_PROFILES=(menu)

Remind that there is a 5 secs timeout for the dialog menu, after which the first profile in alphabetical order is enabled.

Change profile at run time

If you want to change the profile after boot, simply type

netcfg home