I was recently tasked with setting up a blackhole (or sinkhole) DNS server on the network at the office. I was refered to an article that walked through setting one up using FreeBSD.
If you’re not familiar with blackhole/sinkhole DNS servers, basically what they do is when a DNS lookup is performed, the blackhole DNS server consults a list of known malicious domains, if the requested domain is in the list, then any traffic to that domain is redirected to a location of the administrator’s choice. It provides a bit of extra security in that the outgoing traffic is then unable to contact the malicious site. [Read more…] about Setting Up a Blackhole DNS Server on Ubuntu Server