Hello Timothy
On 12.06.2012 04:29, Timothy Oefelein wrote:
2) Do any of you use the limit and/or kod options in your config? I've
noted some really obnoxious clients (bursts of 20+ queries at a time,
every minute or so) hitting my servers in the past and wondered if any
of the other pool admins take proactive steps against such clients.
I also have set limited and kod in the restrict default lines. It
already helped once with a flood of requests and massively reduce
the number of answers from my server. Currently it is still
visible in the Monthly (Week 20) and Yearly (May) graph on [1].
When I checked with tcpdump during the lower level, in 2 minutes
I counted 303 requests, but only 13 answers.
[1] http://www.home4u.ch/ntp/ntp2.home4u.ch.html
As this requests are UDP, the sending IP address could also be
faked. Answering all this requests could hurt an innocent third
party from your server, so limiting is a very good idea.
bye
Fabian
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