Configure interface file 3 public IPS.

Hi
I have a proxmox server running. I have instaled a light ubunntu on my main Public ips.. This IP 1 I only uses for accesing Ubuntu.. adn edit files like interfaces etc.
tehn I have a second Ip. I have made a Virtual machine that I run a webserver IP 2
I have just bought a third public IP that I want to set up a new webserver (virtual machine) IP 3
I entered the interface file on IP1 adn added soem extra lines for a vmb1 setting that Ithought would give IP3 acces to interne.. or vica versa..
Can someone tell me why IP 3 do not work and what I have missunderstood of basic..

auto lo
iface lo inet loopback


# device: eth0






auto eth0
iface eth0 inet manual
address MAIN IP
netmask 255.255.255.192
broadcast 188.40.71.127
gateway 188.40.71.65
pointopoint 188.40.71.65
post-up mii-tool -F 100baseTx-FD eth0






auto vmbr0
iface vmbr0 inet static
address IP2
netmask 255.255.255.192
broadcast 188.40.71.127
gateway 188.40.71.65
bridge_ports eth0
bridge_stp off
bridge_fd 0
up ip route add IP2/32 dev vmbr0




auto vmbr1
iface vmbr1 inet static
address IP3
netmask 255.255.255.192
broadcast 188.40.71.127
gateway 188.40.71.65
bridge_ports eth0
bridge_stp off
bridge_fd 0
up ip route add IP3/32 dev vmbr1






Vmbr0 = ip2 works as before, I can ping IP3 but when I run install and setup on new virtual machine using vbmr1 (IP3) I am not able to do this


error
TASK ERROR: command '/bin/nc -l -p 5900 -w 10 -c '/usr/sbin/qm vncproxy 101 2>/dev/null'' failed: exit code 1


Thx

Ole