network configurational for vm(kvm)

[Ben_e]

i can't configure lan for vm(proxmox kvm). i use this manual
http://wiki.hetzner.de/index.php/Proxmox_VE/en (Network configuration host system
KVM/Routed for single ip). When i install debian 7.1. minimal on vm - network
unreachable. After install i configure /etc/network/interfaces in vm and exec in
command line(vnc) command "service networking start". Command returns:
"rtnetlink answers file exists"
"failed to bring up eth0"

can you help me to solve this problem?

server ip:
83.126.157.44
Gateway: 83.126.157.33
Netmask: 255.255.255.224
Bradcast: 83.126.157.63

additional ip:
83.126.179.246
Gateway: 83.126.179.241
Netmask: 255.255.255.248
Bradcast: 83.126.179.247

host config:

### Hetzner Online AG - installimage
# Loopback device:
auto lo
iface lo inet loopback


# device: eth0
auto  eth0
iface eth0 inet static
  address   83.126.157.44
  broadcast 83.126.157.63
  netmask   255.255.255.224


  pointtopoint 83.126.157.33


  gateway   83.126.157.33


  # default route to access subnet
  up route add -net 83.126.157.32 netmask 255.255.255.224 gw 83.126.157.33 eth0




auto vmbr0
iface vmbr0 inet static
       address   83.126.157.44
       netmask   255.255.255.224
       bridge_ports none
       bridge_stp off
       bridge_fd 0
       up ip route add 83.126.179.246/32 dev vmbr0

guest config:

### Example for a single IP from a different subnet
# Loopback device:
auto lo
iface lo inet loopback
#
# device: eth0
auto  eth0
iface eth0 inet static
       address   83.126.179.246
       netmask   255.255.255.255
       pointopoint   83.126.157.44
       gateway   83.126.157.44