Archive for Blog - page 2

DHCPv6 Prefix Delegation

What is DHCPv6 Prefix Delegation? Coming from IPv4, you’re already familiar with DHCP (for IPv4) which hands out IPv4 addresses to clients. The same applies to (stateful) DHCPv6: it hands out IPv6 addresses to clients. However, with IPv6 we’re heavily dealing with subnets rather than…

Continue reading →

Netzwerk-Monitoring: Ping und Traceroute richtig interpretieren

Klemmt es im Netzwerk, so helfen Ping und Traceroute, Fehler und Engpässe einzukreisen. Wir erklären die Funktionsweise und helfen Angriffe aufzudecken. Diesen Artikel habe ich initial für die c’t geschrieben, wo er im Heft 24/2022 erschienen ist. Als Autor habe ich dankenswerterweise die… Source link…

Continue reading →

More Capture Details III

Another update of the Ultimate PCAP is available. Again, there are some special new packets in there which I want to point out here. Feel free to download the newest version to examine those new protocols and packets by yourself. Featuring: SNMPv3, WoL, IPMI, HSRP,…

Continue reading →

Contributing to Wireshark (without any coding skills!)

For many years I was afraid to open new issues for open-source tools since I am not a coder at all and won’t ever be able to fix some of the problems. Many times I got answers like “The source is open, go ahead and…

Continue reading →

Basic NTP Client Test on Windows: w32tm

When implementing NTP servers, it’s always an interesting part to check whether the server is “up and running” and reachable from the clients. While I’ve done many basic NTP checks out of Linux, I lacked a small docu to do this with Windows. It turned…

Continue reading →

Minor Palo Bug: ICMPv6 Errors sourced from Unspecified Address

During my IPv6 classes, I discovered a (minor) bug at the NGFW from Palo Alto Networks: ICMPv6 error messages, such as “time exceeded” (type 3) as a reply of traceroute, or “destination unreachable” (type 1) as a reply of a drop policy, are not correctly…

Continue reading →

Palo Alto NGFW: Handling of IPv6 on the Interface

For the last few years, I have been confused about Palo Alto NGFWs’ various options for configuring an IPv6 address on a layer 3 interface. Let’s have a look at some details: I’m using a PA-220 with PAN-OS 10.2.4-h2. My Defaults Normally, I’m enabling IPv6…

Continue reading →

Meinberg LTOS: “syslog-ng” and the Observed Implementation Pitfalls

Meinberg, with the great help of Mr Weber, has implemented “syslog over TLS” in the LTOS version 7.06. The following report describes the general advantages of “syslog over TLS” and the implementation of it in the LTOS. Why “Syslog over TLS” is a Good Idea…

Continue reading →

Page 2 of 5 1 2 3 4 5