Re: TAP Network help with QEMU 6.0.0 Win64

[Brendan Simon (eTRIX)]

    I've returned to this after 2 months.  I
      updated OpenVPN TAP drivers to the latest (2.5.3), deleted
      existing TAP interfaces and created 2 new interfaces.
      
      My main issue at the moment is that QEMU segfaults when I specifiy
      TWO network interfaces.  What am I doing wrong or is there a bug?
      
      This is part of my bash script (executed from MSYS2).  NOTE: it
      works if I only specify ONE net device.
    
> accel=whpx
>         
>         qemu="/c/Program Files/qemu/qemu-system-x86_64.exe"
>         
>         "${qemu}" -smp cpus=2 -accel ${accel} -m 4G -parallel none
>         -serial none \
>         -netdev tap,id=mynet0,ifname=OpenVPN_TAP_1 -device
>         e1000,netdev=mynet0 \
>         -netdev tap,id=mynet1,ifname=OpenVPN_TAP_2 -device
>         e1000,netdev=mynet1 \
>         -drive
>         file="d:/Brendan/QEmu/Debian_Buster_Server_64bit_COPY_20210511.qcow2"
>       
    
      Output is:
      
    
> WHPX: setting
>         APIC emulation mode in the hypervisor
>         Windows Hypervisor Platform accelerator is operational
>         whpx: injection failed, MSI (0, 0) delivery: 0, dest_mode: 0,
>         trigger mode: 0, vector: 0, lost (c0350005)
>         /home/brend/bin/qemu-debian-buster-server.sh: line 82:   729 Segmentation
>           fault      "${qemu}" -smp cpus=2 -accel ${accel} -m 4G
>         -parallel none -serial none -netdev
>         tap,id=mynet0,ifname=OpenVPN_TAP_1 -device e1000,netdev=mynet0
>         -netdev tap,id=mynet1,ifname=OpenVPN_TAP_2 -device
>         rtl8139,netdev=mynet1 -drive
>         file="d:/Brendan/QEmu/Debian_Buster_Server_64bit_COPY_20210511.qcow2"
>       
    
      
      Thanks,
      Brendan.

On 13/05/2021 11:13 am, Brendan Simon (eTRIX) wrote:

>       
>       I've just installed the Win64 build of QEMU
>         6.0.0.  I converted a virtualbox Debian image and can get it to
>         run in QEMU :)  but I can't get the tap networking going :(
>         
>         I have installed OpenVPN client and added Virtual Network
>         adapters.  I can see them being connected/not connected when
>         qemu starts, but I can't get any comms (ping/ssh) between
>         Windows Host <-> Linux Guest.
>         
>             -netdev tap,id=mynet0,ifname=Ethernet_QEMU_Tap_1 -device
>         e1000,netdev=mynet0,mac=52:54:98:76:54:01
>             -netdev tap,id=mynet1,ifname=Ethernet_QEMU_Tap_2 -device
>         e1000,netdev=mynet1,mac=52:54:98:76:54:02
>         
>         I have my WiFi adapter setup for Internet Sharing and I selected
>         Ethernet_QEMU_Tap_1 device to share it.
>         I can't get a DHCP address for that interface (`ens3` - which I
>         verified with ifconfig and the mac address).
>         
>         In Linux I can see the Ethernet_QEMU_Tap_2 device.  It is
>         configured with NetworkManager and the device shows up as `ens4`
>         (I can tell by the mac address that shows up in ifconfig).
>         It has an IP address and the routes look ok.
>         However I can not ping the virtual network adapter in windows
>         land (192.168.123.2).
>         ifconfig status show Tx and Rx packets increasing and no errors
>         reported.  Packets are getting lost somewhere.
>         
>         How do I get this working?  Is it a Windows firewall thing or
>         some other config?
>         
>         I'm trying to replicate my VirtualBox setup.  First ethernet
>         being NAT to get Internet access.  Second ethernet being
>         Host-Only with static IP so I can ssh to it from the Windows
>         host.
>         
>         Thanks, Brendan.
>         
>