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dnstest
2013 Nov 06
1
Frequent RRL false negatives when using multiple server processes on Linux
...cking and blocking
again a single source which is flooding positive queries at a ~steady
700 qps rate. rrl-ratelimit setting is the default 200 qps. The
unblock-block happens multiple times a minute. This is causing false
negatives: NSD bursts out 200 responses on every unblock:
Nov 6 10:11:18 dnstest1 nsd[6881]: ratelimit block demo.funet.fi. type
positive target 193.166.5.0/24 query 193.166.5.1 NS
Nov 6 10:11:19 dnstest1 nsd[6876]: ratelimit unblock demo.funet.fi.
type positive target 193.166.5.0/24 query 193.166.5.1 NS
Nov 6 10:11:20 dnstest1 nsd[6881]: ratelimit unblock demo.funet.fi.
type...