Firewalling, Security

Cisco ASA: DNS reply filtering

René Jorissen on August 28, 2009 7 Comments • Tags: #asa #cache #class #dns #drop #expression #filtering #inspect #inspection #map #policymap #regex #regular #request #url

Today I was asked to block access to multiple websites and the only device capable of doing this was the firewall. This customer is using a Cisco ASA firewall, which supports basic URL filtering. This customers wanted to block HTTP and HTTPS websites. HTTPS websites use a SSL tunnel from the end device to the … Read More