[Pool] welcome/ntp questions
fabian at wenks.ch
Wed Jun 13 14:44:37 UTC 2012
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 .
When I checked with tcpdump during the lower level, in 2 minutes
I counted 303 requests, but only 13 answers.
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.
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