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Network interface problem with Windows Server 2016, 2019, 2022 and Windo

From: Arndt Kritzner
Subject: Network interface problem with Windows Server 2016, 2019, 2022 and Windows 10 21H1 (qemu 6.1.0-5)
Date: Thu, 25 Nov 2021 22:55:49 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20080522 Thunderbird/ Mnenhy/


in my virtualization installation (current Arch linux, kvm, AMD, qemu 6.1.0-5, virtio 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=$IFACE -device 
        -netdev tap,id=vnet4,ifname=$IFACE,script=no,downscript=no -device 

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

Kind regards

Attachment: W2012R2S.e1000.2021-11-25_21-49-12.png
Description: PNG image

Attachment: W2012R2S.virtio.2021-11-25_21-49-12.png
Description: PNG image

Attachment: W2016S.e1000.2021-11-25_21-35-01.png
Description: PNG image

Attachment: W2016S.virtio.2021-11-25_21-35-01.png
Description: PNG image

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