I've read so much stuff about this on the web that I'm a bit confused now so wanted to ask here hoping to get some advice.

I have a F21 host with br0 configured with a network-script file to obtain its IP via dhcp (no problems with this), firewalld is running on the host and the guests are using  br0 and dhcp to obtain the IPs from the same source the host/br0 is getting its own IP.

The problem I'm having is that, after some time, packets from the guests are not being forwarded by br0 but I can't quite locate the reason for this.

Why br0 stops forwarding packets? What would be the right approach to get this setup working?

Thanks in advance,

Daniel