Sorry, I was away for a longer time.
Thanks ryecoaaron for your clarification regarding fail2ban. Of course, it makes total sense now.
lev: My system has two physical NICs, eth0 and eth1. I created a bridge (br0) with the the second one (eth1) in OMV's network>interfaces secton and assigned that one to the VM in the KVM plugin (with virtio).
I believe this is the relevant part of the final xml:
Code
<interface type='bridge'>
<mac address='5xxxxx:xxx:xxx'/>
<source bridge='br0'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</interface>
Hope this is still helpful for you.