NAT loopback with virtualbox not working

Hi, I have a problem with my server & virtual server setup. I have one linux server with 2 IPs from my provider, the provider does not alllow different MAC addresses on the switch, so I have to use NAT. On my server there's virtualbox running with am Ubuntu virtual machine inside. This machine is connected via a host-only network to the host. So the host looks like this: eth0 inet addr:81.169.xxx.xxx eth0:1 inet addr:85.214.xxx.xxx vboxnet0 inet addr:192.168.56.1 On the virtual client like this: eth0 inet addr:192.168.56.101 On my host I have the following iptables setup: Code: EXTIF="eth0" #External INTIP="192.168.56.101" #Internal VM EXTIP2="85.214.xxx.xxx" # External IP 2 iptables -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE iptables -t nat -A PREROUTING -d $EXTIP2 -j DNAT --to $INTIP iptables -t nat -A OUTPUT -d $EXTIP2 -j DNAT --to $INTIP This is working okay, the VM client can reach the internet and I can reach the services via the second IP of the host. One thing isn't working though: The client cannot reach itsself via the internet IP :( This is quite annoying, because some services try to lookup themselves through the internet IP and of course fail. What can I do to make this work? I've read in many tutorials that for this "nat loopback" you need to modify the source address to the external interface, so I tried this: iptables -t nat -A POSTROUTING -s $INTIP -d $INTIP -j SNAT --to $EXTIP2 but this is not working either :( Any help would be greatly appreciated!

URL: