Home / Blogs

A Root Server With a View…

Running a DNS server that serves the root gives an interesting view into the world of the DNS. With the ongoing improvements to the ICANN operated L-ROOT, we’ve been fortunate enough to be able to make use of the “DNS Statistics Collector” (DSC) tool.

“DSC” allows us to generate different views of the DNS queries we have been seeing at the L-ROOT systems. Both to the current IP address (199.7.83.42) and to the old address (198.32.64.12).

Top TLD Queries

The above graph shows the commonly queried Top-Level Domains (TLDs) for a single day and the type of queries being asked. These are queries seen across l.root-servers.net. The TLDs change from day to day but some are persistent. No surprises in there really, although some of the TLDs being queried should raise a few eyebrows. Seeing mainly addresses record queries (A and AAAA) for .com or .net, or a lot of requests for reverse delegation information (PTR) in .arpa are logical things to see. However, “.local” is constantly in the top five of queries which is likely an indication of misconfiguration somewhere. Regular appearances are also made by “.localhost”, “.belkin”, “.home”, “.invalid”, “.localdomain” and “.domain”. I leave it to the reader to decide why this is and at whom to point fingers…

RCodes

Clearly one thing is certain, a large portion of the queries we are seeing are for non-existing domains and hence get answered with “NXDOMAIN” (See above). Oh and one last snippet of information. I know that sometimes people do not allow DNS queries over TCP. This is actually not a good idea. According to the RFCs it is OK to query over TCP and in the case of a large enough answer (over 512 bytes) then TCP is typically the way to get that. So although the number of TCP queries is small compared to those using UDP, they can be valid queries.

Protocol

Special thanks have to go to the folks who produced DSC. If only for making my life easier. If people want to see more data or would like to hear more about what we are doing in L-ROOT operations then speak up and I will do my best to inform. After all, we run this for the community. Also see http://l.root-servers.org for information on L-ROOT operations.

By John L. Crain, Chief Technical Officer

Filed Under

Comments

Comment Title:

  Notify me of follow-up comments

We encourage you to post comments and engage in discussions that advance this post through relevant opinion, anecdotes, links and data. If you see a comment that you believe is irrelevant or inappropriate, you can report it using the link at the end of each comment. Views expressed in the comments do not represent those of CircleID. For more information on our comment policy, see Codes of Conduct.

CircleID Newsletter The Weekly Wrap

More and more professionals are choosing to publish critical posts on CircleID from all corners of the Internet industry. If you find it hard to keep up daily, consider subscribing to our weekly digest. We will provide you a convenient summary report once a week sent directly to your inbox. It's a quick and easy read.

I make a point of reading CircleID. There is no getting around the utility of knowing what thoughtful people are thinking and saying about our industry.

VINTON CERF
Co-designer of the TCP/IP Protocols & the Architecture of the Internet

Related

Topics

Domain Names

Sponsored byVerisign

Brand Protection

Sponsored byCSC

IPv4 Markets

Sponsored byIPv4.Global

New TLDs

Sponsored byRadix

Threat Intelligence

Sponsored byWhoisXML API

Cybersecurity

Sponsored byVerisign