VLAN tagging

1- install the package
2- add new inteface like eth0.50 ( /etc/network/interfaces)

sudo apt-get install vlan

#sudo modprobe 8021q

#sudo su -c 'echo "8021q" >> /etc/modules'        #to make it permanent

sudo ip addr add 10.0.0.1/24 dev eth0.100

or: /etc/network/interfaces
auto eth0.50
iface eth0.2 inet static
address 192.168.2.1
netmask 255.255.255.0

1- modify the "main" interfac ( untagged)

2- create the tagged interface

/etc/sysconfig/network-scripts/ifcfg-eth0

# Intel Corporation 82546EB Gigabit Ethernet Controller (Copper)

DEVICE=eth0

HWADDR=00:04:xx:xx:xx:xx

ONBOOT=yes

HOTPLUG=no

BOOTPROTO=none

TYPE=Ethernet

IPV6INIT=no

IPV6_AUTOCONF=no

/etc/sysconfig/network-scripts/ifcfg-eth0.10

# Intel Corporation 82546EB Gigabit Ethernet Controller (Copper)

DEVICE=eth0.10

HWADDR=00:04:xx.xx.xx.xx

ONBOOT=yes

HOTPLUG=no

BOOTPROTO=none

TYPE=Ethernet

VLAN=yes

IPADDR=86.X.X.X

NETMASK=255.255.X.X

Now it's time to start the interfaces. This can be done manually, using /sbin/ifup:

/sbin/ifup eth0

/sbin/ifup eth0.10

Or by using /sbin/service:

/sbin/service network restart