Last week David Conrad of ICANN asked if I could make DSC show the EDNS buffer sizes advertized by clients. This is now available in DSC versions dated after 2008-08-22. Furthermore, the new version is running on the F-root collector nodes.
The breakdown of buffer sizes looked different than I remembered for recent DITL data, so I generated some graphs for the 2006 through 2008 DITL data (F-root nodes) using the same size ranges.
![DITL 200601 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20060110.png)
![DITL 200701 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20070109.png)
![DITL 200803 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20080319.png)
![DSC 200808 (click for larger)](/files/edns-study/tn-edns-f-root-dsc-20080825.png)
The trend is good news. Back in Jan 2007, 50% of queries did not indicate any EDNS support. 20% had bufsiz=2048, and 30% had bufsiz=4096. Now we have about 65% of queries with bufsiz=4096, while 35% still don't support EDNS.
DW
January 2006
![DITL 200601 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20060110.png)
January 2007
![DITL 200701 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20070109.png)
March 2008
![DITL 200803 (click for larger)](/files/edns-study/tn-edns-f-root-ditl-20080319.png)
August 2008
![DSC 200808 (click for larger)](/files/edns-study/tn-edns-f-root-dsc-20080825.png)