On Jun 8, 2012, at 12:26 PM, Stephane Bortzmeyer wrote:
On Fri, Jun 08, 2012 at 03:09:04PM -0400, Joe Maimon <jmaimon@ttec.com> wrote a message of 7 lines which said:
Is there any publicly available rate limiting for BIND?
Not as far as I know. I'm not sure it would be a good idea. BIND is feature-rich enough.
How about host-based IDS that can be used to trigger rtbh or iptables?
What I do (I manage a small and experimental open resolver) is to use iptables this way (porting it to IPv6 is left as an exercice):
iptables -A INPUT -p udp --dport 53 -m hashlimit \ --hashlimit-name DNS --hashlimit-above 20/second --hashlimit-mode srcip \ --hashlimit-burst 100 --hashlimit-srcmask 28 -j DROP
IPv6 should be a simple matter of putting the same line in your ip6tables file. Owen