Hello I see this page https://github.com/xhjcehust/qemu-virtnet-loopback
You are so kind to tell me the network arguments part for connecting on Windows host (with configurated loopback interface named retealoopback) I tried: -netdev tap,id=mynet1,ifname=retealoopback -device virtio-net-pci,netdev=mynet1 as second network adapter Qemu output was: tap: Could not open 'retealoopback' - on standard output stream and C:\Program Files\qemu\qemu-system-x86_64.exe: -netdev tap,id=mynet1,ifname=retealoopback: Device 'tap' could not be initialized - on Debug(error) output stream Context was: C:\Users\antonio.apostoliu>ipconfig .... Ethernet adapter retealoopback: Connection-specific DNS Suffix . : IPv4 Address. . . . . . . . . . . : 192.168.209.1 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : ..... C:\Users\antonio.apostoliu> I used: https://qemu.weilnetz.de/w64/2023/qemu-w64-setup-20230802.exe The loopback interface was configurated with next powershell script Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass $NIC_NAME = "retealoopback" $IpAddress='192.168.209.1' $PrefixLength=24 [string] $strFilenameTranscript = "retealoopback.log" Start-Transcript -path $strFilenameTranscript | Out-Null .\devcon.exe -r install $env:windir\Inf\Netloop.inf *MSLOOP | Out-Null $eth_loopback = Get-NetAdapter|where{$_.DriverDescription -eq "Microsoft KM-TEST Loopback Adapter"} Rename-NetAdapter -Name $eth_loopback.name -NewName $NIC_NAME if ($IpAddress){ New-NetIPAddress -InterfaceAlias $NIC_NAME -IPAddress $IpAddress -PrefixLength $PrefixLength -AddressFamily ipv4 } Set-NetIPInterface -InterfaceIndex $eth_loopback.ifIndex -InterfaceMetric "254" -WeakHostReceive Enabled -WeakHostSend Enabled Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_msclient Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_pacer Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_server Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_tcpip6 Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_lltdio Disable-NetAdapterBinding -Name $NIC_NAME -ComponentID ms_rspndr Stop-Transcript Best regards P.S With https://build.openvpn.net/downloads/releases/tap-windows-9.21.2.zip works
