### Install RouterOS:

# Download RouterOS CD Image from https://mikrotik.com/download.
  Select the X86 version.
    wget https://download.mikrotik.com/routeros/X.XX.X/mikrotik-X.XX.X.iso

# Create a hard disk:
    qemu-img create -f qcow2 mikrotik.qcow2 1G

# Install RouterOS:
    qemu-system-x86_64 \
        -name MIKRO1 \
        -m 512 \
        -smp cpus=1 \
        -enable-kvm \
        -hda mikrotik.qcow2 \
        -cdrom mikrotik-X.XX.X.iso \
        -serial telnet::2000,server,nowait \
        -monitor tcp:127.0.0.1:4000,server,nowait \
        -curses \
        -boot d \
        -net none \
        -net nic,model=e1000,vlan=1,macaddr=4c:5e:0c:01:02:01 \
        -net nic,model=e1000,vlan=2,macaddr=4c:5e:0c:01:02:02 \
        -net nic,model=e1000,vlan=3,macaddr=4c:5e:0c:01:02:03 \
        -net nic,model=e1000,vlan=4,macaddr=4c:5e:0c:01:02:04 \
        -net socket,vlan=1,udp=127.0.0.1:9011,localaddr=:9001 \
        -net socket,vlan=2,udp=127.0.0.1:9012,localaddr=:9002 \
        -net socket,vlan=3,udp=127.0.0.1:9013,localaddr=:9003 \
        -net socket,vlan=4,udp=127.0.0.1:9014,localaddr=:9004

# Install the required packages.

# Once the packages are installed, the router boots and enter
  in the installation again. To poweroff the router and exit,
  open another terminal, enter to the qemu monitor console
  with 'telnet 127.0.0.1 4000' and execute the 'quit' command.

# Done!. RouterOS is installed in the hard disk.


### Use RouterOS.

# Power on the router:
    qemu-system-x86_64 \
        -name MIKRO1 \
        -m 512 \
        -smp cpus=1 \
        -enable-kvm \
        -hda mikrotik.qcow2 \
        -serial telnet::2000,server,nowait \
        -monitor tcp:127.0.0.1:4000,server,nowait \
        -display none \
        -daemonize \
        -net none \
        -net nic,model=e1000,vlan=1,macaddr=4c:5e:0c:01:02:01 \
        -net nic,model=e1000,vlan=2,macaddr=4c:5e:0c:01:02:02 \
        -net nic,model=e1000,vlan=3,macaddr=4c:5e:0c:01:02:03 \
        -net nic,model=e1000,vlan=4,macaddr=4c:5e:0c:01:02:04 \
        -net socket,vlan=1,udp=127.0.0.1:9011,localaddr=:9001 \
        -net socket,vlan=2,udp=127.0.0.1:9012,localaddr=:9002 \
        -net socket,vlan=3,udp=127.0.0.1:9013,localaddr=:9003 \
        -net socket,vlan=4,udp=127.0.0.1:9014,localaddr=:9004

# For TAP connection:
    As root:
        tunctl -u <username> -t <devname>
        ifconfig <devname> <dirip> netmask <mask> up

    qemu:
        -net nic,model=e1000,vlan=<N>,macaddr=4c:5e:0c:01:02:0<N> \
        -net tap,vlan=<N>,ifname=<devname>,script=no

    For delete the TAP interface:
        tunctl -d <devname>

# For bridge connection to real ethernet interface:
    As root:
        ip link add <brname> type bridge
        ip addr flush dev <ethN>  # <-- WARNING!
        ip tuntap add dev <tapname> mode tap user <username>
        ip link set <ethN> master <brname>
        ip link set <tapname> master <brname>
        ip link set dev <brname> up
        ip link set dev <tapname> up
        ip link set dev <ethN> up
        ip addr add <dirip/mask> dev <brname>

    qemu:
        -net nic,model=e1000,vlan=<N>,macaddr=4c:5e:0c:01:02:0<N> \
        -net tap,vlan=<N>,ifname=<tapname>,script=no

    Delete interfaces:
        ip link delete <brname>
        ip link delete <tapname>
        ip link set dev <ethN> down

# Enter to the router serial console:
    telnet 127.0.0.1 2000
    username: admin
    password: <blank>

# To poweroff the router:
    * Inside RouterOS: /system shutdown
    * Outside RouterOS: telnet 127.0.0.1 4000
                        quit

# Warning: the ethernet interfaces can be out of order, check
    the mac address and interfaces names:
        [admin@MikroTik] > /interface ethernet print
        Flags: X - disabled, R - running, S - slave
         #    NAME           MTU MAC-ADDRESS       ARP
         0 R  ether1        1500 4C:5E:0C:01:02:03 enabled
         1 R  ether2        1500 4C:5E:0C:01:02:04 enabled
         2 R  ether3        1500 4C:5E:0C:01:02:01 enabled
         3 R  ether4        1500 4C:5E:0C:01:02:02 enabled