Bridging IP missing for LXC (Linux Containers)

Question

I am using LXC (Linux Containers) to host an http server within a VirtualBox setup, but the simple LXC specific bridge I created does not have an IP address, so it cannot be reached even in the Ubuntu OS running on VirtualBox. (I don't need to reach the server from the real host OS, but I am mentioning it for completeness)

I tried two methods, first is editing /etc/network/interfaces:

auto lxcbr0
iface lxcbr0 inet dhcp
    bridge_ports eth0
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

There is no special setting for LXC.

Second one is use brctl:

sudo brctl addbr lxcbr0
sudo brctl addif lxcbr0 eth0
sudo ip link set dev lxcbr0 up

In the first method, for LXC, ifconfig shows:

eth0      Link encap:Ethernet  HWaddr 00:16:3e:e7:2c:8f  
      inet addr:10.0.2.26  Bcast:10.0.2.255  Mask:255.255.255.0
      inet6 addr: fe80::216:3eff:fee7:2c8f/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:42 errors:0 dropped:0 overruns:0 frame:0
      TX packets:29 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:6146 (6.1 KB)  TX bytes:2666 (2.6 KB)

But at host, there is no :

lxcbr0    Link encap:Ethernet  HWaddr 08:00:27:2b:85:76  
      inet6 addr: fe80::a00:27ff:fe2b:8576/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:168 errors:0 dropped:0 overruns:0 frame:0
      TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:9826 (9.8 KB)  TX bytes:8968 (8.9 KB)

vethFEBAAO Link encap:Ethernet  HWaddr fe:5c:88:b0:88:3b  
      inet6 addr: fe80::fc5c:88ff:feb0:883b/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:33 errors:0 dropped:0 overruns:0 frame:0
      TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:3026 (3.0 KB)  TX bytes:7041 (7.0 KB)

There is no IPv4 address for the bridge at host side. The second method has similar problem as well.

What am I missing?