jsz joshschmelzle

iPerf3 service with systemd

Create file at /etc/systemd/system/iperf3.service with contents from iperf3.service

systemctl

To start a service at boot, use the enable command: sudo systemctl enable iperf3.service
To view the service status, use the status command: sudo systemctl status iperf3.service
To start the service, use the start command: sudo systemctl start iperf3.service
To stop the service, use the stop command: sudo systemctl stop iperf3.service

installing iperf3 and make it start at boot on a ubuntu server.

install iperf3:

sudo apt-get install iperf3

start iperf3 server at startup

Remote PCAP

Requirements:

Windows 10, or newer
Wireshark 3.0, or newer (installed with Sshdump component)
WLAN Pi or SBC (assumption is rpcapd is setup and running)
SSH Client

Can leverage rpcap (remote packet capture) protocol supported by Wireshark to capture raw wireless frames from the WLAN NIC used by the WLAN Pi. This can be leveraged to do a packet capture from a WLAN Pi in a remote location.

ZeroTier (ZT) is open source and free to use for most cases (commercial/proprietary use makes it not free).

It's a network virtualization platform that lets you connect to your devices with automatic end-to-end encryption. Think of it conceptually like a VPN, SDN, and SD-WAN all in one.

Getting Started

Create and verify an account over at https://my.zerotier.com/
Create a network https://my.zerotier.com/network

Using tftpd-hpa - HPA's tftp server on Ubuntu 18.04.3 LTS to host a tftp server.

install tftp server

$ sudo apt install tftpd-hpa

configure tftp server

create new directory for tftp.

A few fonts for coding or your terminal to consider using:

Fonts:

JetBrains Mono - A typeface for developers
Hack - A typeface designed for source code
FiraCoda - Monospaced font with programming ligatures

Resources:

Keybase proof

I hereby claim:

I am joshschmelzle on github.
I am schmelzle (https://keybase.io/schmelzle) on keybase.
I have a public key ASBqdviB8Y4bLU8jeqMnEw_-kZmXcFg4DceO7iAzKScpXAo

To claim this, I am signing this object:

Prep:

Create a symlink to the AirPort command in Terminal:

ln -s /System/Library/PrivateFrameworks/Apple80211.framework/
Versions/Current/Resources/airport /Usr/bin/airport

# test utility
airport -I

tmux

it's a terminal multiplexer that allows access to multiple terminal sessions in a single window. so, you can split terminals into panes. you can move, resize, and switch between them.

it's also useful for detaching processes from the controlling terminal. so, a SSH session can remain active without actually being visible. i recommend using tmux if you're doing remote work via ssh.

tmux hotkeys to help with remote ssh dev

install tmux with sudo apt install tmux.

	import base64
	import scrypt
	import os
	import random

	# password
	password = "hashcat"

	# translation table
	base64chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"