Activity for Matthias Braun
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Why is 32768-60999 the default for local/ephemeral ports? The local port range on my Arch Linux installation is 32768-60999 according to cat /proc/sys/net/ipv4/iplocalportrange Wikipedia states that this range is "used by many Linux kernels" and the kernel documentation says it's the default range. I'm especially interested in the reason for ex... (more) |
— | 1 day ago |
| Answer | — |
A: How is the IPv6 link-local address calculated? It's NetworkManager that sets the IPv6 link-local address and per default it doesn't use the conversion from MAC to IPv6 address of that converter, called modified EUI-64. As mentioned in the linked Wikipedia article, EUI-64 is deprecated for privacy and security reasons. Instead of EUI-64, Networ... (more) |
— | 10 months ago |
| Question | — |
How is the IPv6 link-local address calculated? I was told that an IPv6 link-local address — typically starting with `fe80::` — is derived from the interface's MAC address. Here are some instruction on how to do the conversion. But the conversion result doesn't match my actual IPv6 link-local address according to `ip a`. My IPv6 link-local addr... (more) |
— | 10 months ago |
| Answer | — |
A: Debug NetworkManager with GDB Note that if you want to debug the currently installed version of NetworkManager, you don't have to compile NetworkManager yourself. Instead, make GDB download symbol files via `debuginfod`. You can skip to section "Debug NetworkManager with GDB" of this answer to see how. Clone, configure, and co... (more) |
— | 10 months ago |
| Question | — |
Debug NetworkManager with GDB I'd like to debug NetworkManager by stepping through it using GDB. I assume I'll have to compile NetworkManager from source to get debug symbols since `file /usr/bin/NetworkManager` indicates that the binary is stripped, having no debug symbols. I'm on Arch Linux and I can see that systemd starts ... (more) |
— | 10 months ago |
| Answer | — |
A: Close all desktop notifications While there doesn't seem to be a general command like `notify-send` to hide all notifications, we can use features of our specific notification daemon, like mako in this case, to hide all notifications: makoctl dismiss --all []() (more) |
— | over 2 years ago |
| Question | — |
Close all desktop notifications I'd like to hide/dismiss/remove all the notifications that applications like Signal have created. I know I can create notifications with, for example, `notify-send -t 10000 "🤖 Here goes my message"`. But is there an opposite command, that removes notifications? I read about `org.freedesktop.Not... (more) |
— | over 2 years ago |
| Question | — |
Reverse shell with named pipe and netcat This blog post describes a privilege escalation, exploiting `tar`'s `--checkpoint-action` option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls `tar` via `cron` which causes a script with the following content to run (I adapted the script a bit): rm /... (more) |
— | over 2 years ago |
| Answer | — |
A: Get current server of pacman with `pacman --debug` We can display the mirrors that pacman uses with the `--debug` option. For example, when running `pacman --debug -Sy`, pacman will write lines like these to standard error: debug: core.db: url is http://mirrors.kernel.org/archlinux/core/os/x8664/core.db We can ... (more) |
— | almost 3 years ago |
| Question | — |
Get current server of pacman How do I get the URL of the remote repository that pacman uses to download packages? I know that I can tell pacman which server to use by editing `/etc/pacman.d/mirrorlist`. But in my case, all of the lines are commented out and given that a command like `pacman -Syu` still works, I'm wondering wh... (more) |
— | almost 3 years ago |