Network interface problem with Windows Server 2016, 2019, 2022 and Windows 10 21H1 (qemu 6.1.0-5)

[Arndt Kritzner]

Hi,

in my virtualization installation (current Arch linux, kvm, AMD, qemu 6.1.0-5, virtio 0.1.208.1-1) the guests network is 
configured with tun/tap interfaces and a network bridge. This works on W2012R2 Server guests with e1000 and virtio 
virtual network cards. W2012R2 guests get adresses via DHCP and can communicate (see first two attached screenshots). 
Newer Windows versions (2016S, 2019S, 2022S and 10 21H1) can't communicate - neither with virtual e1000 nor with virtio 
NIC (see last two screenshots).

This effect persists with all these different quemu parametrization variants:
        -net nic,model=virtio-net,macaddr=$macaddr -net tap,ifname=$IFACE
        -nic tap,model=virtio-net-pci,mac=$macaddr,ifname=$IFACE
        -netdev tap,id=n4,ifname=$IFACE -device 
virtio-net,netdev=n4,mac=$macaddr
        -netdev tap,id=vnet4,ifname=$IFACE,script=no,downscript=no -device 
virtio-net,netdev=vnet4,mac=$macaddr

Any ideas to solve this problem or to investigate further in this?

Kind regards
Arndt

W2012R2S.e1000.2021-11-25_21-49-12.png
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W2012R2S.virtio.2021-11-25_21-49-12.png
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W2016S.e1000.2021-11-25_21-35-01.png
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W2016S.virtio.2021-11-25_21-35-01.png
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