I configured my Debian (with KVM on board) as following:
/etc/network/interfaces:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet manual
auto vmbr0
iface vmbr0 inet static
address 176.x.y.133
netmask 255.255.255.224
gateway 176.x.y.129
bridge_ports eth0
bridge_stp off
bridge_fd 0
dns-nameservers 8.8.8.8 8.8.4.4
After reboot I have following ifconfig (ip a):
1: lo: ...
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether AA:BB:CC:DD:EE:FF brd ff:ff:ff:ff:ff:ff
inet6 fe80::a60:6eff:feDD:EEFF/64 scope link
valid_lft forever preferred_lft forever
3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/ether AA:BB:CC:DD:EE:FF brd ff:ff:ff:ff:ff:ff
inet 176.x.y.133/27 brd 176.x.y.159 scope global vmbr0
inet6 fe80::a60:6eff:feDD:EEFF/64 scope link
valid_lft forever preferred_lft forever
4: venet0: <BROADCAST,POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/void
inet6 fe80::1/128 scope link
valid_lft forever preferred_lft forever
So eth0 and vmbr0 having the same MAC-addresses (AA:BB:CC:DD:EE:FF). Is it bad or should it be so?
Extra: I want create a network with VMs on KVM-Host, where VMs are having public IPs (I have one main IP for the KVM-Host and two additional single IPs for the VMs).