I was presenting at the annual “Wireshark Developer and User Conference“, the SharkFest’25 EU, talking about “Securing DNS – Attacks and Defences“. It covered all the buzzwords related to DNS security, such as malware using DNS, DNS spoofing, DNS exfiltration & tunnelling, while defending them with the keywords as DNSSEC, DoH/DoT, feeds & blocklists, and so on.
Quite many techniques. ;) Luckily, the whole session was recorded. So if you’re interested, have a look!
While I was working on my presentation about “Secure DNS” for this year’s SharkFest, the Wireshark Developer and User Conference, I recognised that I’m still missing some DNS-related packet captures in the Ultimate PCAP, that is DNS over TLS and DNS over HTTPS. And while working on it with the DNSDiag toolkit (thanks, Babak!), I came across DNS over QUIC and DNS over HTTP/3. 😂 Here we go:
We all know the DNS, right? But when we need to troubleshoot it, it’s getting much more complicated than initially thought. DNS ≠DNS ≠DNS. And unfortunately: It’s Always DNS.
To get a better understanding of those different kinds of DNS servers (authoritative vs. recursive), DNS messages (recursive, iterative, zone transfer, …) as well as other techniques (conditional forwarding, DoH, …), I drew a poster to have it all at a glance! Here it is: