limiting number of recursion/queries per IP address
kirgudu at corbina.net
Tue Nov 9 14:22:58 UTC 2010
This is not good idea to use statefull firewall on heavy loaded DNS
server. firewall becomes low place in the system.
As workaround you can use dns_flood_detector + simple script to insert
and remove IP's from firewall blocking table or chain.
27.10.2010 23:26, Sebastian Tymków пишет:
> In FreeBSD you can use pf to limit connections using tables and setting
> up rate limit.
> Best regards,
> On Tue, Oct 26, 2010 at 9:29 PM, Kebba Foon <kebba.foon at qcell.gm
> <mailto:kebba.foon at qcell.gm>> wrote:
> On Tue, 2010-10-26 at 15:22 -0400, Todd Snyder wrote:
> > What version of bind, on what OS?
> I use Debian 5.0 with bind 9.6-ESV-R1 but also i thought that the OS
> might have some security holes so i try FreeBSD 8.1 with BIND 9.7.1 but
> still have ihave the same problems.
> > here may be some things you can do with iptables to limit connections
> > http://www.debian-administration.org/articles/187
> i will just look into these but it done thing iptables will be the ideal
> > I don't recall seeing anything native to BIND that would allow for
> limits per src.
> > t.
> > -----Original Message-----
> > From: bind-users-bounces+tsnyder=rim.com
> <http://rim.com>@lists.isc.org <http://lists.isc.org>
> <http://rim.com>@lists.isc.org <http://lists.isc.org>] On Behalf Of
> Kebba Foon
> > Sent: Tuesday, October 26, 2010 2:27 PM
> > To: bind-users at lists.isc.org <mailto:bind-users at lists.isc.org>
> > Subject: limiting number of recursion/queries per IP address
> > Dear List,
> > Is is possible to limit the number of recursion/queries per IP
> > there is some kind of virus thats bombarding my dns servers with a lot
> > of queries, i realize that when ever the total number of recursion
> > clients reach 1000 dns resolution stop working. i have increase the
> > recursive-clients to 10000 but still these those not help. and also i
> > have increase the number of max open files on my OS which at one point
> > was complaining about too many open files. can someone please
> direct me
> > to how best to solve this problem its some kind of DDOS.
> > Thanks
> > Kebba
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