Adding a virtual NIC in centos 7

If you don’t need to route any traffic over it, you could use the dummy interface

eg before:

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 52:54:00:0c:d8:88 brd ff:ff:ff:ff:ff:ff

Now we use the dummy module, and get a new interface:

$ sudo modprobe dummy
$ sudo ip link set dummy0 address 10:20:30:40:50:60
$ ip link show dummy0                            
3: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT 
    link/ether 10:20:30:40:50:60 brd ff:ff:ff:ff:ff:ff

This has created an interface called dummy0 with the MAC address we requested.

Another option could be to create a tap device:

$ sudo ip tuntap add dev tap0 mode tap
$ sudo ip link set tap0 address 10:20:30:40:50:61
$ ip link show tap0
4: tap0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT qlen 500
    link/ether 10:20:30:40:50:61 brd ff:ff:ff:ff:ff:ff

With tap devices you can call it any name you like, even cheat and call it eth1.

Make Permanent

/etc/sysconfig/network-scripts/ifcfg-tap0

DEVICE=tap0
ONBOOT=yes
BOOTPROTO=none
TYPE=Tap

bring it up with

ifup ifcfg-tap0

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