Shakiba Moshiri shakibamoshiri

Install FIO on Ubuntu/Debian:

sudo apt update
sudo apt install -y fio lshw

Install FIO on Fedora:

How to tunnel SSH over SSL/TLS

laptop ssh -> laptop stunnel -> evil network -> internet -> your server -> your server ssh

Server (your shell server/home box/work box/whatever)

Sets up a stunnel process listening externally on port 2443/tcp, forwards to localhost 22/tcp

Install stunnel, e.g. yum install stunnel
Install server config snippet to /etc/stunnel/stunnel.conf

OpenVPN and browser specific network routing with ip netns

Create network bridge

A network bridge allows us to have a virtual router that we can plug multiple network interfaces into. The IP address is assigned to the bridge rather than the individual network interface.

Create the bridge device, br0 :

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

Ctrl-Key: ^[
Octal: \033
Unicode: \u001b
Hexadecimal: \x1B
Decimal: 27

	{
	"dns": {
	"servers": [
	{
	"tag": "dns_proxy",
	"address": "https://1.1.1.1/dns-query",
	"address_resolver": "dns_resolver",
	"strategy": "ipv4_only",
	"detour": "select"
	},

	#!/bin/bash
	# A script to limit the outgoing bandwidth of the consensus and execution layers by port
	# We do this because the highest cost for running a node in AWS is the outgoing bandwidth

	# Define your ports and their corresponding rate limits
	declare -A ports=([30303]="500kbit" [9000]="1mbit")

	# Define arbitrary class IDs for each port
	declare -A class_ids=([30303]=1 [9000]=2)

	##TCP FLAGS##

	Unskilled Attackers Pester Real Security Folks
	==============================================
	TCPDUMP FLAGS
	Unskilled = URG = (Not Displayed in Flag Field, Displayed elsewhere)
	Attackers = ACK = (Not Displayed in Flag Field, Displayed elsewhere)
	Pester = PSH = [P] (Push Data)
	Real = RST = [R] (Reset Connection)
	Security = SYN = [S] (Start Connection)

	# https://www.percona.com/blog/2008/11/07/poor-mans-query-logging/

	tcpdump -i eth0 -s 0 -l -w - dst port 3306 \| strings \| perl -e '
	while(<>) { chomp; next if /^[^ ]+[ ]*$/;
	if(/^(SELECT\|UPDATE\|DELETE\|INSERT\|SET\|COMMIT\|ROLLBACK\|CREATE\|DROP\|ALTER)/i) {
	if (defined $q) { print "$q\n"; }
	$q=$_;
	} else {
	$_ =~ s/^[ \t]+//; $q.=" $_";
	}

	# install netctl
	sudo pacman -S netctl --noconfirm

	# check network card name
	ip link

	### Config Static IP Address ###
	# Card Name : eth0
	sudo cp /etc/netctl/examples/ethernet-static /etc/netctl/eth0

	#!/bin/bash

	## Create the response FIFO
	rm -f response
	mkfifo response

	function handle_GET_home() {
	RESPONSE=$(cat home.html \| \
	sed "s/{{$COOKIE_NAME}}/$COOKIE_VALUE/")
	}