Arch: VLANs in rc.conf

• the package vconfig is needed in order to use VLANs

 pacman -Sy vconfig

• There were several approaches in the Forum to configure VLANs in rc.conf. The Problem is: therefor its necessary to do extensive changes in “/etc/rc.d/network”.
• After a update its possible that all changes are gone.
• I wasn't interested in doing multiple changes in “/etc/rc.d/network” after updates.
• That's why I write my own variant. It's only needed to change two lines.

• With my Script it's only Possible to add VLAN and not to remove.
• “vconfig” is designed that after a reboot VLAN interface are not configured.
• If you want to achieve more, further changes have to include into “/etc/rc.d/network” and I wanted to avoid this.

• First the Script, put it into “/etc/conf.d”.

create_vlans

#!/bin/bash
#FILES
#       /proc/net/vlan/config
#       /proc/net/vlan/[vlan-device]
# rc.conf:
# VLANs
#
#VLAN_DEVS=(eth0.6)
######
# /etc/rc.d/network
# vlan settings
#[ -f /etc/conf.d/create_vlans ] && . /etc/conf.d/create_vlans
#
### Variables ###
LSMOD_PATH="/usr/bin/lsmod"
VLAN_PATH="/proc/net/vlan/"
VCONFIG_PATH="/usr/sbin/vconfig"
#
### Functions ###
vlan_add()
{
	if [ -e $VCONFIG_PATH ];then
		/usr/bin/lsmod | grep 8021q > /dev/null 2> /dev/null
		if [ $? == 0 ];then
			if [ ! -e $VLAN_PATH$1 ];then
				VLANS_DEV=$1
				VLAN_IFACE=`echo $VLANS_DEV | cut -d "." -f1`
				VLAN_ID=`echo $VLANS_DEV | cut -d "." -f2`
				$VCONFIG_PATH add $VLAN_IFACE $VLAN_ID > /dev/null 2> /dev/null
			fi
		else
			echo "8021q Module not loaded"
		fi
	else
		echo "please install vconfig: pacman -S vconfig"
	fi
}
vlan_rem()
{
	vconfig rem $1
}
#
### Main ###
if [ ! -e $LSMOD_PATH ];then
	echo "/usr/bin/lsmod not available, unable to check vlan module"
else
	for vlans in ${VLAN_DEVS[@]}; do
		vlan_add $vlans   
	done
fi

• Adapt “/etc/rc.d/network” Attention: the changed are gone after update initscripts.
• Add these lines before the other includes.

# vlan settings
[ -f /etc/conf.d/create_vlans ] && . /etc/conf.d/create_vlans

• VLAN interfaces now can be entered in the rc.conf.
• With “VLAN_DEVS=()” the interfaces were created [Interface.VLAN_ID].
• Then you can assign an IP-Adresse to the interface. The interface name is “vlan6” for example. This name must not contain “.” or “ ”.

Example:

#VLANs
VLAN_DEVS=(eth0.6)

interface=eth0
address=
netmask=
broadcast=
gateway=

interface=eth0.6
address=172.16.10.1
netmask=255.255.0.0
broadcast=172.16.255.255
gateway=