DNS query spam

["Piotr Kamisiski" <rotunda@xxxxxxxxxxxxx>]

Hi all,

Recently my DNS servers get jammed with bogus queries. The attacks come in 
series, taking a few minutes each, sometimes from different IPs at the 
same time, at least twice a day.

<snap>
23:05:40.241026 IP 204.92.73.10.40760 > xx.xx.xx.xx.53:  38545+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:41.600902 IP 204.92.73.10.16561 > xx.xx.xx.xx.53:  22242+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:42.091743 IP 204.92.73.10.37547 > xx.xx.xx.xx.53:  64644+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:43.433539 IP 204.92.73.10.32370 > xx.xx.xx.xx.53:  31772+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:43.854481 IP 204.92.73.10.12913 > xx.xx.xx.xx.53:  33470+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:44.378640 IP 204.92.73.10.62484 > xx.xx.xx.xx.53:  8726+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:45.368970 IP 204.92.73.10.57384 > xx.xx.xx.xx.53:  1073+ [1au] ANY ANY? 
e.mpisi.com. (40)
23:05:45.379251 IP 204.92.73.10.36997 > xx.xx.xx.xx.53:  22257+ [1au] ANY ANY? 
e.mpisi.com. (40)
<snap>

Has anyone noticed a similar activity?


Best regards,
Piotr Kamisiński