Hi, I just tested the master code, the passt just exited without any error. ``` $ ./passt Outbound interface: ens192 ARP: address: 00:50:56:be:9d:1f DHCP: assign: 192.168.64.217 mask: 255.255.240.0 router: 192.168.64.1 search: . UNIX domain socket bound at /tmp/passt_1.socket You can now start qrap: ./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio or directly qemu, patched with: qemu/0001-net-Allow-also-UNIX-domain-sockets-to-be-used-as-net.patch as follows: kvm ... -net socket,connect=/tmp/passt_1.socket -net nic,model=virtio 21-10-26 13:23:43 root(a)192.168.64.217:~/passt(master✗) ``` Another terminal: ``` $ bash x.sh recv: Connection reset by peer Probe of /tmp/passt_1.socket failed connect: No such file or directory Probe of /tmp/passt_2.socket failed connect: No such file or directory Probe of /tmp/passt_3.socket failed ... ``` ``` $ cat x.sh ./qrap 5 /root/qemu-master/build/qemu-system-x86_64 -uuid 1869b108-42b3-42a7-852e-70261d73f6a9 -name guest=1869b108-42b3-42a7-852e-70261d73f6a9 -cpu host -enable-kvm -smp 4 -device pci-bridge,chassis_nr=1,id=pci.0 -device pci-bridge,chassis_nr=1,id=pci.1 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x10 -fsdev local,security_model=mapped,id=fsdev-fs0,path=/root -device virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=fs0 -device intel-iommu,device-iotlb=on,intremap=on -M q35,accel=kvm,kernel-irqchip=split -serial mon:stdio -nographic -m size=2048M,maxmem=32G,slots=128 -device virtio-balloon -drive file=/root/fedora34.qcow2,format=qcow2,cache=none,aio=native,if=none,id=drive-virtio-disk1,file.locking=off -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk1,id=virtio-disk1,bootindex=1 -vnc 0.0.0.0:101 -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-222-29ec19c9-d330-4949-b/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -qmp tcp:0.0.0.0:2235,server,nowait -device virtio-serial-pci,id=virtio-serial0,max_ports=16 -net socket,fd=5 -net nic,model=virtio ``` Thanks, Feng Li