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Re: TAP Network help with QEMU 6.0.0 Win64

From: Brendan Simon (eTRIX)
Subject: Re: TAP Network help with QEMU 6.0.0 Win64
Date: Fri, 16 Jul 2021 16:31:13 +1000
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0

I managed to install qemu 6.0.0 via the msys2 package manager and that had the exact same problem.  i.e. works ok with one net device specified but segfaults if two net devices are specified.

On 16/07/2021 12:30 pm, Brendan Simon (eTRIX) wrote:
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.

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"


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 (
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.

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