Why VM cannot get the public IP I have from provider?

I have a KVM-Host (on Debian) with

root@kvm-host:/# cat /etc/network/interfaces

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 # Provider's GW IP
  bridge_ports eth0
  bridge_stp off
  bridge_fd 0


root@kvm-host:/# route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
176.x.y.128     0.0.0.0         255.255.255.224 U     0      0        0 vmbr0
0.0.0.0         176.x.y.129     0.0.0.0         UG    0      0        0 vmbr0


root@kvm-host:/# arp -an

? (176.x.y.155) at <incomplete> on vmbr0
? (176.x.y.129) at xx:yy:zz:11:22:33 [ether] on vmbr0


root@kvm-host:/# ifconfig

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

I have public IPs: 176.x.y.133 (KVM-Host), 176.x.y.151, 176.x.y.155.

Now I'm trying to get the network on each VM:

user@VM:/$ cat /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 176.x.y.155
  netmask 255.255.255.255
  pointtopoint 176.x.y.133
  gateway 176.x.y.133

I uninstalled the network-manager.

Next steps:

user@VM:/$ sudo ifup eth0
RTNETLINK answers: File exists
Failed to bring up eth0


user@VM:/$ ping 176.x.y.133
connect: Network is unreachable

root@VM:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

(i.e. empty, no even default gateway)

user@VM:/$ sudo add default via 176.x.y.133
RTNETLINK answers: no such process

user@VM:/$ sudo arp -a
(i.e. empty)

user@VM:/$ sudo arp -s 176.x.y.133 AA:BB:CC:DD:EE:FF
SIOCSARP Network is unreachable

I can't even set static routes (MAC-addr./IP-addr.).

What could be the problem to set a network on the VM? (I hope I provided all the needed information to be specific)

Check that the MAC address is not randomly generated; many ISPs will only allocate IPs to MAC addresses that are issued by valid providers. I was able to get an IP on a machine by taking a known-good one, incrementing the last octet by one.

Edit: make sure "brctl show vmbr0" shows something sensible. Something like

xen-br0         8000.90b11c316da4       no              eth0

Why VM cannot get the public IP I have from provider?

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