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I respectfully suggest that the thread is not flagged as SOLVED.

I will try to find out what changed in libvirtd service, but I would appreciate your help, since I'm not really a developer.

Cheers

Sorry, marked as not solved, good luck!

Cool for me, thanks you all for your help!

Cheers from Brazil.

Fontenele

Hello there,

Searching around, in other forums, with those two commands below, i was able to start QEMU/KVM network:
My question now is: With dnsmasq disabled, what other problems i could have with my network and Debian 12 in general?

Thanks in advance for your support.

Fontenele

Hello,

de gen. 12 09:45:44 XXX systemd-networkd[512]: wlp3s0: DHCPv4 address 192.168.1.67/24, gateway 192.168.1.1 acquired from 192.168.1.1
de gen. 12 09:45:46 XXX named[1011]: listening on IPv4 interface wlp3s0, 192.168.1.67#53
de gen. 12 09:45:52 XXX named[1011]: listening on IPv4 interface virbr0, 192.168.122.1#53
de gen. 12 09:45:53 XXX dnsmasq[1243]: failed to create listening socket for 192.168.122.1: Address already in use
de gen. 12 09:45:53 XXX libvirtd[1009]: internal error: Child ...

dnsmasq: failed to create listening socket for 192.168.122.1: Address already in use
Who's that?
maybe something like
ss -p -o | grep 192.168

udp ESTAB 0 0 192.168.100.6%enp4s0:bootpc 192.168.100.1:bootps
tcp ESTAB 0 0 192.168.100.6:35000 34.206.101.32:https users:(("firefox-esr",pid=6385,fd=113)) timer:(keepalive,1min31sec,0)
tcp ESTAB 0 0 192.168.100.6:53790 185.70.42.37:https users:(("firefox-esr",pid=6385,fd=116))

or
journalctl -b 0 -g 192.168 --no-pager

This one gave a ...

Hello there,

I think, due to the updates today, QEMU/KVM network is not starting

Result of sudo systemctl status libvirtd:
erro:Falha ao iniciar a rede default
erro:erro interno: Processo filho (VIR_BRIDGE_NAME=virbr0 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper) inesperado status de saída 2:
dnsmasq: failed to create listening socket for 192.168.122.1: Address already in use

Result of sudo systemctl ...

Thanks for the "apt install systemd-timesyncd", wasn't present over here, Debian 11 non-free Cinnamon.