Friday, 17 April 2015

DNS Stress testing with hping3

1. Compile our program to generate the DNS payload (sipher@utensil)(~/dnsstress)$ gcc gr2.c -o gr2 2. Generate DNS payload (sipher@utensil)(~/dnsstress)$ ./gr2 (sipher@utensil)(~/dnsstress)$ hexdump -C dns.txt 00000000 24 1a 01 00 00 01 00 00 00 00 00 00 06 67 6f 6f |$............goo| 00000010 67 6c 65 03 63 6f 6d 00 00 01 00 01 |gle.com.....| 0000001c 3. Get the size of the request (Important for passing to hping3 -d paramater) (sipher@utensil)(~/dnsstress)$ ls -lah |grep dns.txt -rw-rw-r-- 1 striemer striemer 28 Apr 17 10:30 dns.txt (sipher@utensil)(~/dnsstress)$ 4. Fire!! use --flood if you're brave. Use --rand-source to test state tables. (sipher@utensil)(~/dnsstress)$ sudo hping3 localhost --udp -V -p 53 --file /home/sipher/dnsstress/dns.txt -d 28 --fast Alternate way to deliver the packets... NOTE: Won't be as fast since it's not using raw sockets and it's waiting for reply. (sipher@utensil)(~/dnsstress)$ nc -u localhost 53 < dns.txt

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