Posts Tagged ‘DNS

Tonight, I figured out how to add the Resolved IP Addresses for a host to measurement data and store that information for further debugging. It was very simple – I was trying to find complex solutions to this issue.
Turns out the solution is built right into PERL: The Socket module.
My thought is that I will [...]

DNS hijacking is an occurrence that sends fear into the hearts of man and beast. It takes a perfectly harmless (yet critical) process and turns it into a weapon for chaos and mayhem.
This tool, however, does not simply reside in the hands of people looking to maliciously redirect traffic for purposes I can’t quite fathom [...]

This afternoon, the two GrabPERF Agents at Technorati were switched back to using their local copies of caching BIND for resolving DNS entries.
Some folks at Microsoft who stopped by to look at their results on the Search Performance Index noticed that there were one or two outliers in the results from these locations. When I [...]

This is a “re-print” of an article I had on Webperformance.org that I notice that a number of people search for.

See additional information on how not to use Round-Robin DNS.
The use of Round-Robin DNS for load-balancing has been around for a number of years. It is meant to serve as a way to have multiple [...]

In my presentations and consultations on Web performance, I emphasize the importance of a correctly configured DNS system with the phrase: “If people can’t resolve your hostname, your site is dead in the water”.
Yesterday, it appears that the large anti-virus and security firm Sophos discovered this lesson the hard way.
Of course hindsight is perfect, so [...]

cURL is an application that can be used to retrieve any Internet file that uses the standard URL format — http://, ftp://, gopher://, etc. Its power and flexibility can be added to applications by using the libcurl library, whose API can be accessed easily using most of the commonly used scripting and programming languages.
So, how [...]

We are in the process of relocating the GrabPERF servers to new IP addresses. You may experience some weirdness as the DNS propagates, but this should die down in a couple of days.
If you do hit an issue, you can still reach the server at http://208.66.64.70/.
Technorati Tags: GrabPERF

Motorola made some site changes today.
The name servers they have listed at the TLD servers are:
ftpbox.mot.com. [129.188.136.101] [TTL=172800] [US]motgate.mot.com. [129.188.136.100] [TTL=172800] [US]
The Authoritative name servers that Motorola list are:
ftpbox.mot.com. [129.188.136.9] [TTL=59719]
motgate.mot.com. [129.188.136.100] [TTL=59719]
Ummm…DNS is a vital thing. Screw it up, and YOU TAKE YOURSELF OFF THE INTERNET!
If you can get to Motorola’s site…let me know.
Technorati [...]


About this blog

Stephen Pierzchala is one of a 10-year veteran of the Web performance field who also writes on topics that interest his non-linear world-view.

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