By default Linux ignores Broadcast and Multicast ICMP messages. That's why you need to enable it first:
sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=0To join any mutlicast address (e.g. 224.10.10.10/24) just add it to your active interface (e.g. eth0) and append the keyword autojoin at the end:
DST=/mnt
find /var/lib -type f -size +1G -exec ls -lh {} \; | tee $DST/bigfiles_var_lib_$(date "+%H%M").log
find /var/lib -type f -size +1G -exec ls -lh {} \; | awk '{ print $5 ": " $9 }' | sort -rh > $DST/bigfiles_var_lib_$(date "+%H%M").sorted.log
I created a crude comparison of the syntax of the various common Markdown extensions to have a better view on what are the most common extensions and what is the most widely accepted syntax for them. The list of Markdown flavors that I looked at was based on the list found on CommonMark's GitHub Wiki.
| Flavor | Superscript | Subscript | Deletion* Strikethrough |
Insertion* | Highlight* | Footnote | Task list | Table | Abbr | Deflist | Smart typo | TOC | Math | Math Block | Mermaid |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GFM |
I'm still not sure what but on both my systems my keys just don't get loaded back into the ssh-agent on restarts and new login sessions. I got annoyed enough at it that I jumped through the hoops of putting ssh-add into a script and writting a property list file to load as a launchagent to fix it.
If you haven't done so already you can use the well written gub hub instructions for generating ssh keys. Once you get them generated you'll add them with ssh-add -K <sshkey> where sshkey is the file path/name. Keys are stored by default in your ~/.ssh folder
Note that you may need to use ssh-add --apple-use-keychain in Big Sur onward instead of ssh-add -K. I discovered the issue in Montery after skipping Big Sur.
The manual method (assuming your keys were stored into the Mac OS Keychain) is to open up Terminal
This brief tutorial will show you how to go about analyzing a raw binary firmware image in Ghidra.
I was recently interested in reversing some older Cisco IOS images. Those images come in the form of a single binary blob, without any sort of ELF, Mach-o, or PE header to describe the binary.
While I am using Cisco IOS Images in this example, the same process should apply to other Raw Binary Firmware Images.
PlantUML is a really awesome way to create diagrams by writing code instead of drawing and dragging visual elements. Markdown is a really nice documentation tool.
Here's how I combine the two, to create docs with embedded diagrams.
Get the command-line PlantUML from the download page or your relevant package manager.
This will guide you through setting up a replica set in a docker environment using.
Thanks to https://gist.github.com/asoorm for helping with their docker-compose file!
If you're a roaming user or you're trying to link a satellite office to the main network, SSH can handle the job. Other solutions exist, and SSH isn't perfect, but this is probably the simplest trick out there.
OpenSSH since version 4.3 has the ability to set up TUN/TAP tunnels. I'm sure most of you have set up port-forwarding via SSH, but this is a little
| #!/bin/bash | |
| echo "Building Debina 10 QEMU instance..." | |
| wget https://cdimage.debian.org/cdimage/ports/10.0/powerpc/iso-cd/debian-10.0-powerpc-NETINST-1.iso | |
| sudo apt install qemu | |
| # Create new disk for install | |
| qemu-img create -f qcow2 debian10.qcow2 2000M | |
| # Boot the install image | |
| qemu-system-ppc -L pc-bios -boot d -M mac99 -m 1024 -net nic,model=sungem -net user -hda debian10.qcow2 -cdrom ./debian-10.0-powerpc-NETINST-1.iso -g 1024x768x8 | |
| # Run the image | |
| qemu-system-ppc -L pc-bios -boot c -prom-env "boot-device=hd:,\yaboot" -prom-env "boot-args=conf=hd:,\yaboot.conf" \ |
