Networking


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Mikrotik DNS Redirect

Recently, we needed to check if any computers inside of a given network were configured to use OpenDNS servers. In our case, the router (10.10.100.1) is acting as a DNS cache and configured to query…


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Mikrotik DNS Failover Script

Traditionally, a minimum of two DNS servers are used for any given computer for redundancy. The problem is that Windows computers (and others) will choose the fastest responding server and ignore the order given (primary,…


Dnsmasq on CentOS 6 for Filtering

DNS filtering is a quick and easy method to block access to certain websites. It can be used to block third party advertisements within websites, block known malware infected sites, and can even be used…