lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 30 Nov 2005 04:41:37 +0000
From: Stephen Stuart <>
To: Antone Roundy <>
Subject: Re: DNS query spam

> Assuming you use Bind, can edit your named.conf file, only wish to  
> provide recursive DNS services (ie. handle queries for domains that  
> you are not authoritative for) to a known range of IP addresses, and  
> the query is for a domain that you're not authoritative for, you can  
> solve the problem by adding something like this to named.conf:
> options {
>     allow-recursion {; };
> };
> That particular setting would cause Bind to ignore recursive queries  
> from all IP addresses except (localhost).  My DNS server  
> only provides recursive queries for itself, so the setting was easy  
> for me.  After I started blocking recursive queries, it took a week  
> or so for the bogus traffic to stop.  But in the mean time, since I  
> wasn't sending responses, the amount of my bandwidth that was wasted  
> decreased dramatically.

Small correction: that will cause BIND to not perform recursive
queries from any IP address except You will still answer
queries from cache for all comers, unless you also restrict queries in
general to

options {
    allow-query {; };


Powered by blists - more mailing lists