VLAN-EN
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Indice
Introduction
VLANs allows to split a LAN. Linux accepts tagged traffic and shows every virtual interface as a different network interface (for example eth0_10 for the VLAN 10)
Configuration
Add a VLAN
# ip link add link INTERFACE name INTERFACE_VID type vlan id VID
Example:
# ip link add link eth0 name eth0_10 type vlan id 10
Type:
# ip link
to ensure that the eth0_10 interface has been correctly created.
Configure the VLAN
To add an IPv4 address to the just created interface and activate it:
# ip addr add IP/NETMASK brd BROADCAST-ADDR dev INTERFACE_VID # ip link set dev INTERFACE_VID up
Example:
# ip addr add 192.168.100.1/24 brd 192.168.100.255 dev eth0_10 # ip link set dev eth0_10 up
Deconfigure a VLAN
To correctly deactivate a VLAN before remove it
# ip link set dev INTERFACE_VID down
Example:
# ip link set dev eth0_10 down
Remove a VLAN
To remove a VLAN
# ip link delete INTERFACE_VID
Example:
# ip link delete eth0_10
Script
VLAN Creation/Activation
Below there is a short script (integrated starting from the version 12.12) that allows the creation/activation of a VLAN
| File: add_vlan.sh |
#!/bin/sh echo "== Welcome in the VLAN creation procedure ==" echo "VLAN Configuration" # Interface to configure (for example eth0) echo -n "Interface to configure (for example eth0): " read nic_to_cfg # VLAN ID to configure (for example 10) echo -n "VLAN ID (for example 10): " read vlan_id # VLAN adding ip link add link $nic_to_cfg name "$nic_to_cfg"_$vlan_id type vlan id $vlan_id # Configuration echo -n "IP to assign to the interface (for example 192.168.1.10): " read ip_addr echo -n "Netmask to assign to the interface (for example 255.255.255.0): " read ip_netmask echo -n "Broadcast address (for example 192.168.1.255): " read ip_brd ip addr add $ip_addr/$ip_netmask brd $ip_brd dev "$nic_to_cfg"_$vlan_id ip link set dev "$nic_to_cfg"_$vlan_id up if [ $? -eq 0 ] ; then echo "VLAN successfully created and activated!" else echo "Error during VLAN activation!!" fi |
VLAN Deactivation/Removal
Below there is a short script (integrated starting from the version 12.12) that allows the VLAN deactivation/removal
| File: del_vlan.sh |
#!/bin/sh echo "== Welcome in the VLAN removal procedure ==" # Interface to deconfigure (for example eth0) echo -n "Interface to deconfigure (for example eth0): " read nic_to_cfg # ID of the VLAN to remove (for example 10) echo -n "ID of the VLAN to remove (for example 10): " read vlan_id # Disable VLAN ip link set dev "$nic_to_cfg"_$vlan_id down # VLAN removal ip link delete "$nic_to_cfg"_$vlan_id if [ $? -eq 0 ] ; then echo "VLAN" $vlan_id "removed!" else echo "Error during VLAN removal!" fi |
Useful links
- Information VLAN (wikipedia)
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