Setup networking

tap kext needs Tunnelblick should be installed

for creating use these commands:

sudo ifconfig bridge0 create
sudo ifconfig bridge0 192.168.122.1 192.168.122.255
sudo kextload  /Applications/Tunnelblick.app/Contents//Resources/tap-notarized.kext

for destroying use these commands:

sudo ifconfig bridge0 down
sudo ifconfig bridge0 destroy
sudo kextunload  /Applications/Tunnelblick.app/Contents//Resources/tap-notarized.kext

Start/Stop dnsmasq

For start stop dnsmasq (dhcp+tftp):

sudo port load dnsmasq

sudo port unload dnsmasq

dnsmasq conf is at /opt/local/etc/dnsmasq.conf and content is:

interface=bridge0
enable-tftp
dhcp-range=192.168.122.100,192.168.122.200
tftp-root=/opt/local/var/tftpboot
#dhcp-boot=pxelinux.0
dhcp-match=set:ipxe,175
dhcp-boot=tag:!ipxe,undionly.kpxe
dhcp-boot=tftp://192.168.122.1/pxelinux.cfg/ipxe.cfg

inside tftp-root:

/opt/local/var/tftpboot
├── osdev-kernel
├── pxelinux.cfg
│   └── ipxe.cfg
└── undionly.kpxe
 
1 directory, 3 files

HobbyOS supports only undionly pxe boot. ipxe.cfg content is:

#!ipxe
 
kernel tftp://192.168.122.1/osdev-kernel
boot

Start qemu

sudo qemu-system-x86_64 -net nic,model=virtio,macaddr=54:54:00:55:55:55 -net tap,script=tap-up,downscript=tap-down -M q35 -m 1g -monitor stdio

tap-up script

#!/bin/sh
TAPDEV="$1"
BRIDGEDEV="bridge0"
ifconfig $BRIDGEDEV addm $TAPDEV

tap-down script

#!/bin/sh
TAPDEV="$1"
BRIDGEDEV="bridge0"
ifconfig $BRIDGEDEV deletem $TAPDEV