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For packet geeks like me, the annual Wireshark conference SharkFest is the place to be in order to meet and network with other packet geeks. However, for various reasons I haven't been able to attend SharkFest before. So when my friend Jasper Bongertz mentioned that there was going to be a SharkFest conference here in Europe I felt that this was a chance I just couldn't miss.
One thing I really liked about SharkFest Europe (#sf16eu) was the unique chance to discuss topics such as network traffic analysis and protocol specifications with other attendees. One example of such a discussion was an interesting breakfast conversation regarding whether the TCP receive window size is affected when TCP segments are SACK'ed.
Many Wireshark core developers are flown in to the Sharkfest events, so this is a golden opportunity to discuss feature requests or bugs you might have encountered in Wireshark. I grabbed the opportunity to talk to many of the core developers and I was amazed by how very friendly and humble all the developers were. I get a feeling that this great atmosphere is set by the tone of Gerald Combs. As a direct result of talking to the Wireshark developers I was able to read packets from PacketCache directly from Wireshark.
There were, of course, also several great presentations at SharkFest Europe. Many of these talks were recorded and can now be found on the SharkFest'16 Europe Retrospective page.
One of my favorite presentations was Jasper's talk titled “Tackling the Haystack: How to Process Large Numbers of Packets”, where he provided some reflections from working with large PCAP datasets to find network problems or intrusions. Jasper gave lots of good advice on how to approach the task of analyzing PCAP datasets containing several hundred gigabytes of captured traffic.
One particular wisdom that Jasper shared with the audience was, ”I never filter on port during captures. […] Capture everything, sort it out later”. This is fully in line with how I perform network sniffing for forensic purposes. I even have a name for sniffing traffic without capture filter; I call it is sniffing in “Pokemon mode”, which of course refers to the “catch 'em all” slogan.
I also enjoyed Eddi Blenkers' talk “Windows Filesharing De-Mystified: SMB with a Eureka! Effect” where Eddi took us for a trip down memory lane to revisit the early days of NetBIOS and the “Yellow Cable” a.k.a. Thick Ethernet (10BASE5).
Eddi's talk was extra interesting for me since he did a deep dive into the NetBIOS, SMB and SMB2 protocols. Several things that Eddi mentioned were actually new to me, even though I have personally spent many hours reading protocol specifications and implementing parsers in for all these protocols.
The fact that I and Eddie have approached these protocols from different angles and for different purposes is most likely the reason why we have both deep-dived into different aspects of these protocols. I usually analyze SMB traffic when performing network forensics in order to find out what commands and resources an attacker accesses on a compromised network, while the work Eddi presented focused on finding bottlenecks and performance problems in a Windows file sharing environment.
For me, who has primarily worked with incident response and network forensics, meeting all these experts in network performance troubleshooting was a refreshing change of crowd compared to the security researchers and hackers that I usually meet at security conferences. Nevertheless, there were many SharkFest visitors working in the security field as well as within law enforcement, so I felt quite at home as well.
It's interesting to see, that in this great mix of different professions and industries, all attendees at SharkFest Europe come together for a common interest; to better learn how to analyze captured network traffic.
Erik Hjelmvik is the Developer of NetworkMiner, a Network Forensic Analysis Tool (NFAT) and a frequent contributor to Garland Technology's Expert Corner and Tap into Technology blog.
Read more from Erik.
Photo: Garland's Chris Bihary with Erik at Sharfest '16 Europe
Erik Hjelmvik is an experienced incident handler and software developer who who has specialized in network forensics and network security monitoring. Erik is also known in the network forensics community for having created NetworkMiner, which is an open source network forensics analysis tool. Since the release of NetworkMiner in 2007 it has become a popular tool among incident response teams and law enforcement. Today, NetworkMiner is used by companies and organizations all over the world and is included on popular live-CDs such as Security Onion and REMnux. Erik is also one of one of the founders behind the Swedish company Netresec, which is an independent software vendor with spearhead competence in network security monitoring and network forensics. Netresec develops and sells software products specially designed to capture and analyze network traffic on the wire as well as in pcap files.