From: carnil@debian.org   
      
   Control: reassign -1 iptables   
   Control: forcemerge 1128561 -1   
      
   Hi,   
      
   On Sun, Feb 22, 2026 at 12:43:53PM +0000, zipdox wrote:   
   > Package: libvirt-daemonVersion: 12.0.0-1   
   > Severity: grave   
   >   
   > I'm not sure I know exactly what's going on here. I marked this bug as grave   
   at it makes KVM completely unusable unless you don't use networking. I believe   
   Debian unstable moved from iptables to nftables a while ago, which broke   
   libvirt networking. I'   
   ve been getting around that by using an older kernel (6.17.x, don't remember   
   exactly which one) but that stopped working after I upgraded yesterday.   
   >   
   > I get the following error when I try to start the default (NAT) network:   
   > $ sudo virsh net-start default   
   > error: Failed to start network default   
   > error: internal error: Failed to run firewall command iptables -w --table   
   filter --list-rules:   
   >   
   > Running that command manually I get:   
   > $ sudo iptables -w --table filter --list-rules   
   > modprobe: FATAL: Module ip_tables not found in directory /lib/   
   odules/6.18.12+deb14-rt-amd64   
   > iptables v1.8.12 (legacy): can't initialize iptables table `filter': Table   
   does not exist (do you need to insmod?)   
   > Perhaps iptables or your kernel needs to be upgraded.   
   >   
   > Again, I'm not sure exactly what's going on here. It's possible this issue   
   was already reported, but I couldn't find it.   
      
   This looks the same as #1128561.   
      
   Regards,   
   Salvatore   
      
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