Deflecting Bogus Queries -- Machine Under Attack, PLEASE HELP.

Sten Carlsen ccc2716 at vip.cybercity.dk
Thu Aug 5 17:29:02 UTC 2004


Hi

How about making a local zone for which you are authorative and return 
"no A record present". At least it will stop any recursive lookups.


Dan Mahoney wrote:

>I'm presently dealing with a DNS server that's under attack, and is
>being made to spew out DNS responses all over the internet, hundreds,
>maybe thousands a second.
>
>I cannot trace the source IP to log it or ban it because it's
>obviously forged, and there's enough DNS traffic on the wire that it's
>suitably masked.
>
>I'd like to know if I can just somehow set bind to DROP all queries
>for the domain in question.  No response, no nothing, just silently
>ignore them.  It won't make the attack stop, but at least it'll stop
>me from being used as a reflector.
>
>These domains don't even exist.  I thought about redirecting an NS
>record for these subdomains elsewhere, but it wouldn't really matter
>since I think the attack is ignoring true DNS.
>
>Here's a quick log:
>
>Jul 30 19:36:18 cp named[6408]: client 24.158.63.9#53: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 205.152.37.254#42256: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.82.0.5#32770: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 66.215.64.14#54971: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 216.158.48.2#1041: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 24.25.35.64#48487: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 205.188.118.92#33518: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 206.13.30.27#9904: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 167.206.3.232#32772: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 216.68.4.20#3408: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 209.244.4.171#32776: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spasm.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 67.32.118.46#32819: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.82.0.5#32770: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.39.224.5#44247: query:
>spaz.elephaunt.org IN A
>Jul 30 19:36:18 cp named[6408]: client 68.46.144.5#34740: query:
>spasm.elephaunt.org IN A
>
>Replies to this address are appreciated, although I will of course
>check the group.  danm at ezzi dot net is also useful.
>
>  
>

-- 
Best regards

Sten Carlsen

Let HIM who has an empty INBOX send the first mail.



More information about the bind-users mailing list