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Fixing open DNS servers

Ok, there seems to be a *lot* of posts and threads about this issue and I think a simple page is appropriate.

Lets start with the problem. Check the report for your domain here: http://www.dnsreport.com/tools/dnsreport.ch?domain=YOUR_DOMAIN_HERE.COM

An open DNS server is one that replies to a query about a domain it is not responsible for, to anyone who asks for it. For starters, that is just a waste of processing time, but it can be worse if it is used for flooding. See, since a DNS query is (much!) smaller in number of bytes than a DNS response, if it is spoofed it can be used to perform a DoS attack on a computer with several times the bandwidth of the perpretator.

I’ve posted a solution to my obscure cPanel guide, have a look if your interested:
Fixing Open DNS servers

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Tags: bind, DNS, GNU/Linux, hacking, hosting, Security, WHM

Related posts:

  • Major flaw on the DNS Internet architecture discovered
  • The Definite Guide of Obscure Tweaks to Install and Maintain cPanel / WHM (version 10)
  • modsec.sh updated

This entry was posted on Thursday, September 28th, 2006 at 7:42 pm and is filed under GNU/Linux, hosting, WHM. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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