cant create network with virt-manager

[Marko Horn]

hello list,
i cant create an isolated network with the virt-manager.

installed version virt-manager 3.0.0
installed version libvirt 6.2.0

output in error-message:

Error creating virtual network: internal error: Failed to apply firewall 
rules /sbin/iptables -w --table filter --insert LIBVIRT_INP 
--in-interface virbr3 --protocol tcp --destination-port 67 --jump 
ACCEPT: iptables: No chain/target/match by that name.


Traceback (most recent call last):
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in 
cb_wrapper
     callback(asyncjob, *args, **kwargs)
   File "/usr/share/virt-manager/virtManager/createnet.py", line 428, in 
_async_net_create
     netobj.create()
   File "/usr/lib/python3.7/site-packages/libvirt.py", line 3174, in 
create
     if ret == -1: raise libvirtError ('virNetworkCreate() failed', 
net=self)
libvirt.libvirtError: internal error: Failed to apply firewall rules 
/sbin/iptables -w --table filter --insert LIBVIRT_INP --in-interface 
virbr3 --protocol tcp --destination-port 67 --jump ACCEPT: iptables: No 
chain/target/match by that name

any ideas?

thank you
marko


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