We have a client who has just got the BT business fibre that provides 5 usable static IP addresses, often referred to as "NO NAT 5". We are familiar with setting up the BT business connections with a PPPoE config on the outside interface connected directly to the BT Modem but where only one static IP address is used. However, this No NAT 5 product is a little more tricky. They assign a 255.255.255.248 mask giving the standard 8 addresses, of the 6 host addresses one is used on the ASA inside interface with NO NAT. The outside interface of the ASA gets a dynamic IP address from BT using DHCP which changes periodicaly, so in effect BT host the public addresses then send all traffic to the DHCP address assigned to the connection. My question is simply does anyone have a sample config showing how to configure the inside interfaces to route the various public IP addresses. For example our client has a web server which needs a NO NAT set up with the public IP address on the inside. They also have a LAN scope of 172.16.0.0/24 which is running NAT but uses one of the public IP addresses to access things like RDP to their server with port redirection. Any suggestions and help with the config greatly appreciated.
All you need to do is configure NAT using those public ip addresses on the ASA firewall for those servers/hosts that you need access from the Internet.