Absolutely. To bind the external IPs you need to use Proxy ARP and then add the necessary NAT rules to pass the traffic to your LAN machines. You can also configure the rules to let only the traffic you want from those machines to go out. If you wish them to go out as the external IP's you will have to configure a 1:1 NAT for them. Have a read through the Monowall handbook and you should get some info on how to do this.
OK - short question: Why Proxyarp - what has arp to do with the external ips?
They are given to me by the isp...
I only want to get 5xips on the wan-port...
Short explanation, what you mean with proxyarp - i donĀ“t see the realtion with arp-adresses and my whises - or i am blind :-)
Thanxs!
Andy