DNS - connection limit (without any extra hardware)

Gadi Evron ge at linuxbox.org
Fri Dec 8 15:58:04 UTC 2006

On Fri, 8 Dec 2006, Luke wrote:
> Hi,
> as a comsequence of a virus diffused in my customer-base, I often receive
> big bursts of traffic on my DNS servers.
> Unluckly, a lot of clients start to bomb my DNSs at a certain hour, so I
> have a distributed tentative of denial of service.
> I can't blacklist them on my DNSs, because the infected clients are too
> much.
> For this reason, I would like that a DNS could response maximum to 10
> queries per second given by every single Ip address.
> Anybody knows a solution, just using iptables/netfilter/kernel tuning/BIND
> tuning, without using any hardware traffic shaper?

"I have a bots infested network, they really task my services! How can I
make my services ignore them so that the clients start calling me and
spending my tech support budget?"

> Thanks
> Best Regards
> Luke


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