Call for testing: Suricata 4.1rc2 released

Suricata 4.1rc2 is ready for testing. We’re hoping that this will be the final release candidate so that 4.1 can be released just before Suricon next month.

Main new features are inclusion of the protocols SMBv1/2/3, NFSv4, Kerberos,FTP, DHCP, IKEv2, as well as improvements on Linux capture side via AF_PACKET XDP support and on Windows IPS side via WinDivert. The growth of Rust usage inside Suricata continues as most of the new protocols have been implemented in Rust.

Most important change for going from RC1 to RC2 is that we have enabled Rust support by default. If Rust is installed, it will be used.

Protocol updates

  • SMBv1/2/3 parsing, logging, file extraction
  • TLS 1.3 parsing and logging (Mats Klepsland)
  • JA3 TLS client fingerprinting (Mats Klepsland)
  • TFTP: basic logging (Pascal Delalande and ClĂ©ment Galland)
  • FTP: file extraction
  • Kerberos parser and logger (Pierre Chifflier)
  • IKEv2 parser and logger (Pierre Chifflier)
  • DHCP parser and logger
  • Flow tracking for ICMPv4
  • Initial NFS4 support
  • HTTP: handle sessions that only have a response, or start with a response
  • HTTP Flash file decompression support (Giuseppe Longo)

Output and logging

  • File extraction v2: deduplication; hash-based naming; json metadata and cleanup tooling
  • Eve metadata: from rules (metadata keyword) and traffic (flowbits etc)
  • Eve: new more compact DNS record format (Giuseppe Longo)
  • Pcap directory mode: process all pcaps in a directory (Danny Browning)
  • Compressed PCAP logging (Max Fillinger)
  • Expanded XFF support (Maurizio Abba)
  • Community Flow Id support (common ID between Suricata and Bro/Zeek)

Packet Capture

  • AF_PACKET XDP and eBPF support for high speed packet capture
  • Windows IPS: WinDivert support (Jacob Masen-Smith)


  • Windows: MinGW is now supported
  • Detect: transformation keyword support
  • Bundled Suricata-Update
  • Per device multi-tenancy

Major changes since 4.1rc1

  • Rust support is enabled by default
  • Community Flow Id support (common ID between Suricata and Bro/Zeek)
  • Updates and fixes for dealing with SegmentSmack/FragmentSmack
  • Update Suricata-Update to 1.0.0rc2

Get paid to work on Suricata!

Enjoying the testing? Or want to help out with other parts of the project?
We are looking for people, so reach out to us if you’re interested.

Special thanks

Mats Klepsland, Jason Taylor, Maurizio Abba, Konstantin Klinger, Giuseppe Longo, Danny Browning, Hilko Bengen, Jacob Masen-Smith, Pascal Delalande, Travis Green, Christian Kreibich


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SuriCon 2018 Vancouver next month, you can still join!

About Suricata

Suricata is a high performance Network Threat Detection, IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF). Suricata is developed by the OISF, its supporting vendors and the community.