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Re: DNS query spam

Would you be able to share the iptables rules you're using to combat this?

Thanks


Josep Ma Castells wrote:
I have the same problem, now I'm blocking this attempts with iptables and the Recent module when a number of tries is reached. 

This is the content of the packet:
=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

11/20/05-19:17:37.177173 168.143.XXX.XX:11752 -> YYY.YYY.Y.YY:53
UDP TTL:233 TOS:0x0 ID:34960 IpLen:20 DgmLen:68 DF
Len: 48
0x0000: 00 07 95 C2 6A 32 00 04 76 DA CB 14 08 00 45 00  ....j2..v.....E.
0x0010: 00 44 88 90 40 00 E9 11 2A D5 A8 8F 71 0A C0 A8  .D..@...*...q...
0x0020: 04 01 2D E8 00 35 00 30 00 00 20 9E 01 00 00 01  ..-..5.0.. .....
0x0030: 00 00 00 00 00 01 01 65 05 6D 70 69 73 69 03 63  .......e.mpisi.c
0x0040: 6F 6D 00 00 FF 00 FF 00 00 29 27 10 00 00 00 00  om.......)'.....
0x0050: 00 00                                            ..

=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

Regards,


Josep Ma Castells
----- Original Message ----- From: "Piotr Kamisiski" <rotunda@xxxxxxxxxxxxx> 
To: <bugtraq@xxxxxxxxxxxxxxxxx>
Sent: Sunday, November 27, 2005 11:30 PM
Subject: DNS query spam



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