Andrew, I assume the external /30 public subnet has been assigned from your ISP. The other /30 Public Address you own? If this is the case, then you can ask the ISP to route the current internal /30 Public subnet to your External public address. This has to be done and could cost. Configure the internal interface for the LAN as you want it. The WAN (External) Interface should be configured for the current External Public IP Address. Cisco can have a secondary and third address. I need to verify this, but I don't think you would be required to configure this. You should have a static route which sends all traffic out your WAN port. So the correct route path is maintained. Natting under Cisco isn't something I have done yet. Sean