Add a virtual network interface

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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

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