Clik here to view.
iPad Ping: WLAN vs. LAN
Meine Kids spielen derzeit häufig Brawl Stars, ein Echtzeit Onlinespiel. Und sie schauen auch immer mal Videos dazu, bei denen ihnen jetzt der Floh ins Ohr gesetzt wurde, dass man ein iPad ja auch per...
View ArticleClik here to view.
Getting started with the APIs from Palo Alto Ntwks
You can talk to firewalls and Panorama from Palo Alto Networks in various ways. The well-known GUI (which I really love, by the way) and the CLI are quite common at first glance. Nearly everyone using...
View ArticleClik here to view.
Joining an Active Directory: A Packet Capture
What happens on the network if you’re joining a Microsoft Active Directory domain? Which protocols are used? As I suspected, it’s a bit more complex than just seeing a single known protocol like HTTPS....
View ArticleClik here to view.
Laden an öffentlichen Säulen: Ein Trauerspiel!
Seit einem Monat fahre ich erstmalig ein E-Auto. Und ebenso positiv euphorisch bin ich an das Laden an öffentlichen Säulen herangegangen. Dazu gab es auch allen Grund: Überall sieht man solche...
View ArticleClik here to view.
Wallbox: Die Qual der Wahl
Die Aufgabenstellung war klar: Eine Wallbox fürs Eigenheim muss her, schließlich ist das Laden an öffentlichen Säulen ein Trauerspiel. Aber die Entscheidung, welche Wallbox es sein soll, war dann alles...
View ArticleClik here to view.
It’s Always DNS – Poster
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...
View ArticleClik here to view.
It’s Always DNS! @ SharkFest’23 EU
This time (2023) at the yearly Wireshark Developer and User Conference in Europe, I gave a talk about DNS. How could it have been any different –> The title simply had to be ‘It’s Always DNS‘. 😂...
View ArticleClik here to view.
Das Domain Name System
Kaum ein anderes Element ist so essenziell für das Internet wie das Domain Name System. Ruckelts mal im DNS, reagieren Webseiten und überhaupt alle Internetanwendungen gleich langsamer oder gar nicht....
View ArticleClik here to view.
xDSL-Modems
Wenn man eine Enterprise-Firewall an einem klassischen DSL-Anschluss verwenden möchte, benötigt man ein extra DSL-Modem. Dies unterscheidet sich von Heimkundenroutern wie der Fritzbox, die immer schon...
View ArticleClik here to view.
Dual-Stack PPPoE on a Palo Alto Firewall
If you want to establish an Internet connection (that is: IPv6 and IPv4) right away from your firewall through xDSL connections, you need quite some technologies: PPPoE and PPPoEv6 (PPP IPV6CP) along...
View ArticleClik here to view.
DHCPv6 Prefix Delegation on a FortiGate Firewall
I got DHCPv6-PD aka prefix delegation up and running on a FortiGate. Yes! ✅ Configuring it is tricky since it’s not always clear, which options to use. You cannot see everything in the GUI (it even...
View ArticleClik here to view.
Dual-Stack PPPoE on a FortiGate Firewall
You can use a FortiGate to connect to the Internet (that is: Dual-Stack!) directly in various ways. In my current setup, I’m using a PPPoE residential xDLS connection. It’s not that easy to configure...
View ArticleClik here to view.
Which KPIs to monitor on a Palo Alto Firewall?
We wanted to monitor some of our Palo firewalls from our monitoring system via the API. But: Which enhanced metrics/KPIs shall we monitor? While there are some obvious ones such as interface counters,...
View ArticleClik here to view.
Path MTU Discovery
One of the mysteries for me in IP networks was the Path MTU Discovery (PMTUD) process. I’ve seldom seen any problems with the MTU at all. Fortunately, while troubleshooting some router issues, I...
View ArticleClik here to view.
Palo Alto Networks Announces Strategic Shift to Apparel Manufacturing
Palo Alto Networks, a global leader in cybersecurity solutions, has announced a significant strategic shift. The company will transition from its core cybersecurity business to exclusively focus on...
View Article