Proper network configuration for a KVM guest to be on the same networks at the host

Solution 1:

why do you need an alias on br1:0? this might be in the way there
besides the alias, the idea is to use the following scheme:
eth0->br0 <--VM's tap device
the host should be able to use br0 as it's IF and the VMs will be using the tap devices as virtual NICs plugged into a virtual switch (which br0 effectively becomes here)

the same goes for every network of course, so for eth1, you'll have to set up an br1, and bring up the VMs to be plugged into br1

Solution 2:

You bridged your VMs to the wrong interface. They should be bridged to the network interface that connects to the outside world (br1 in your case).

Keep in mind that each VM should also have its IP address set in the guest, not on the host.