Add a virtual network interface

Add a virtual network interface

Set environmental variables

You will need following information of the real interface. (ie: ifconfig eth0)

• IP address
• IP Mask
• Broadcast Address

  # Real interface that virtual one will direct
  export REAL_INTERFACE_NAME=eth0
  # Fake interface name
  export COMMON_INTERFACE_NAME=vinterface
  # IP address of REAL_INTERFACE_NAME
  export REAL_IP=$(ifconfig $REAL_INTERFACE_NAME | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}')
  # Mask bit of real interface
  export REAL_MASK=24
  # Broadcast IP of real interface (0.0.0.0 for docker container)
  export REAL_BROADCAST_IP=$(ifconfig eth0 | grep 'Bcast:' | cut -d: -f3 | awk '{print $1}')
  # Random ID. Leave it if you will add only one interface
  export VLAN_ID=32
  

Execute them all

ip link add link $REAL_INTERFACE_NAME name $COMMON_INTERFACE_NAME type vlan id $VLAN_ID
ip link
ip -d link show $COMMON_INTERFACE_NAME
ip addr add $REAL_IP/$REAL_MASK brd $REAL_BROADCAST_IP dev $COMMON_INTERFACE_NAME
ip link set dev $COMMON_INTERFACE_NAME up

(Optional) Check if interface appears

ifconfig

Remove interface

ip link delete $COMMON_INTERFACE_NAME