Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine developed by the OISF and the Suricata community.
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Victor Julien 61cdd9be6b dns: detect case of request flooding
In the case where DNS requests are sent over the same flow w/o a
reply being received, we now set an event in the flow and refuse
to add more transactions to the state. This protects the DNS
handling from getting overloaded slowing down everything.

A new option to configure this behaviour was added:

app-layer:
  protocols:
    dnsudp:
       enabled: yes
       detection-ports:
         udp:
           toserver: 53
       request-flood: 750

The request-flood parameter can be 0 (disabling this feature) or a
positive integer. It defaults to 500.

This means that if 500 unreplied requests are seen in a row an event
is set. Rule 2240007 was added to dns-events.rules to match on this.
13 years ago
benches
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contrib Add one shot run option to suri-graphite. 14 years ago
doc
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m4
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qa coccinelle: implement parallel check 13 years ago
rules dns: detect case of request flooding 13 years ago
scripts
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src dns: detect case of request flooding 13 years ago
.gitignore unittest: make check use a qa/log dir for logging 13 years ago
COPYING
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ChangeLog Update changelog for 2.0beta1 13 years ago
LICENSE
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Makefile.am Use wget or curl to download ruleset. 13 years ago
Makefile.cvs
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acsite.m4
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autogen.sh
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classification.config
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config.rpath Add file needed for some autotools version. 13 years ago
configure.ac configure: accept libnet 1.1 and 1.2. 13 years ago
doxygen.cfg
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mkinstalldirs
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reference.config
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suricata.yaml.in profiling: introduce per keyword profiling 13 years ago
threshold.config
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