DNS | Booches.nl

Google Public DNS

René Jorissen on December 4, 2009 • 3 Comments • Tags: #dns #google #public

I just read an article about Google publishing a Public DNS service. Google Public DNS is a free, global DNS resolution service. Google recommends using their Public DNS server as an alternative to your current DNS servers. To try it out: Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your … Read More

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

Security

Serious DNS Vulnerability

René Jorissen on July 24, 2008 • 0 Comments • Tags: #dan #dns #kaminsky #vulnerability

I guess you already read about it, but if not here a short outcome. Despite Dan Kaminsky’s efforts to keep a lid on the details of the critical DNS vulnerability he found, someone at the security firm Matasano leaked the information on its blog yesterday, then quickly pulled the post down. But not before others … Read More