I just found your forum with a google search, hopefully someone can help me out.
I am looking for a device that will plug in behind a device on my network, a router or raspberry PI running a firewall distro or firmware that can block access to specific IP's or IP ranges. I have used DDWRT and PfSense but I am no expert at the configuration of the firewall in either software package. I am looking for a way to block a PC from seeing a handful of IP addresses on a network without a major configuration to the existing network. The main network is Windows 2008r2 AD controlled but the device that I wish to restrict is a linux based network device.Will DDWRT achieve this? or IPfire or PfSense, ArchLinux? Any suggestions on how I might do this or guides online will be a great help.