setup linux bridge between RouterOS & Alpine linux hosts

this docs is second part of this

first thing that we need to do is create a copy of qcow2 alpine, so we do not need to re-install again. do not forget to change the hostname & password for easy identification

setup bridge

sudo ip link add br0-lan type bridge
sudo ip link add br1-lan type bridge

setup TAP

tap0 & tap1 connected to br0-lan tap2 & tap3 connected to br1-lan

sudo ip tuntap add dev tap0 mode tap
sudo ip tuntap add dev tap1 mode tap
sudo ip tuntap add dev tap2 mode tap
sudo ip tuntap add dev tap3 mode tap
sudo ip link set tap0 master br0-lan
sudo ip link set tap1 master br0-lan
sudo ip link set tap2 master br1-lan
sudo ip link set tap3 master br1-lan
sudo ip link set tap0 up
sudo ip link set tap1 up
sudo ip link set tap2 up
sudo ip link set tap3 up

launch mikrotik ISO

qemu-system-x86_64 \
      -enable-kvm \
      -boot order=d \
      -drive file=chr.qcow2,format=qcow2 \
      -m 256M \
      -smp 4 \
      -netdev tap,id=net0,ifname=tap0,script=no,downscript=no \
      -device virtio-net-pci,netdev=net0,mac=02:11:2a:3b:ff:c3  \
      -netdev tap,id=net1,ifname=tap2,script=no,downscript=no \
      -device virtio-net-pci,netdev=net1,mac=02:1a:f2:f1:21:b5  \
      -nographic \
      -net user,hostfwd=tcp::10022-:22,hostfwd=tcp::8291-:8291 \
      -net nic

based on topology, we know that

02:11:2a:3b:ff:c3 used by tap0 (in routerOS, bridge 0)
02:1a:f2:f1:21:b5 used by tap2 (in routerOS, bridge 1)
tap1 & tap3 used by alpine virtual machine

now run alpine iso

alpine (as pc-1)

qemu-system-x86_64 \
            -enable-kvm \
            -m 256 \
            -smp 4 \
            -cpu host \
            -drive file=pc-1.qcow2,format=qcow2 \
            -cdrom alpine-virt-3.21.3-x86_64.iso \
            -boot d \
            -nographic \
            -netdev tap,id=net0,ifname=tap1,script=no,downscript=no \
            -device virtio-net-pci,netdev=net0

alpine (as pc-3)

qemu-system-x86_64 \
            -enable-kvm \
            -m 256 \
            -smp 4 \
            -cpu host \
            -drive file=pc-2.qcow2,format=qcow2 \
            -cdrom alpine-virt-3.21.3-x86_64.iso \
            -boot d \
            -nographic \
            -netdev tap,id=net0,ifname=tap3,script=no,downscript=no \
            -device virtio-net-pci,netdev=net0

WinBox config

first, we need to see the configuration & which etherX by looking to spesific mac-addr, we find out that

[admin@MikroTik] > /interface print
Flags: D - dynamic, X - disabled, R - running, S - slave 
 #     NAME                                TYPE       ACTUAL-MTU L2MTU  MAX-L2MTU MAC-ADDRESS      
 0  R  ;;; wan
       ether1                              ether            1500                  52:54:00:12:34:56
 1  R  ether4                              ether            1500                  02:11:2A:3B:FF:C3
 2  R  ether5                              ether            1500                  02:1A:F2:F1:21:B5
[admin@MikroTik] >

next thing, lets configure our ip using winbox, this is ip configuration

DHCP server section

now, try run udhcpc -i eth0 on each vm

Fadhil Books & Notes