My ADSL provider is providing me with a routed subnet over ADSL.
I have two IP address ranges: the PPP range (to estabilish the PPP connection between the modem and the ISP) and what they call the LAN range, a /30 which is the publicly routable subnet that they route to the modem.
Now, in the default setup they gave me, they assigned the second LAN address to the router and the third LAN address to a NAT. So, basically, all I really have is just one public IP which I use to surf the Internet through NAT.
Since I want to use all the four IP addresses they are routing to me, without caring for the fact that they are a subnet, I'd like the modem not to have an IP address and to just "reroute" all the four IPs to a firewall such as pfSense.
How can I do this?