dnsreflector

This software review is about the dnsreflector daemon which functions by monitoring DNS queries on a local UDP port and responds with records indicating the looping-back to localhost. In combination with OpenBSD's packet filter pf(4), this feature makes for an efficient spamtrap tool. The dnsreflector was exclusively designed and tested to operate in tandem with OpenBSD. However, if you have a particular interest in running this software on a different platform, kindly reach out to the developer.

The setup instructions for dnsreflector involve the integration of a spamd table with a persistent setup, redirction from spamd to any port 53 with a response from 127.0.0.1 port 53000. For usage purposes, dnsreflector comes with various flags accessible through the use of command-line arguments. These include the daemon flag(-d), bind address flag(-a), and bind port flag(-p).

In response to popular demand, the developer has provided a service that allows those with Linux operating systems to compile dnsreflector. This feature was tested with SuSE, and to ensure its successful application, a facility to redirect DNS queries sourced from blacklisted hosts to dnsreflector will be required. While the developer acknowledges that they are not familiar with network filtering in Linux, users who possess said knowledge are urged to share information.