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@nerdalert
nerdalert / Netfilter-IPTables-Diagrams.md
Last active April 9, 2024 09:18
Linux NetFilter, IP Tables and Conntrack Diagrams

Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

@Belphemur
Belphemur / build_nginx.sh
Last active November 13, 2022 13:05 — forked from MattWilcox/build_nginx.sh
Compiling Nginx with LibreSSL (and http2)
#!/usr/bin/env bash
# names of latest versions of each package
export NGINX_VERSION=1.15.5
export VERSION_NGINX=nginx-$NGINX_VERSION
export VERSION_LIBRESSL=libressl-2.8.1
export VERSION_PCRE=pcre-8.42
#export NPS_VERSION=1.9.32.10
#export VERSION_PAGESPEED=v${NPS_VERSION}-beta
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import javax.net.ssl.SSLServerSocketFactory;
/*
* Source from Christopher Schultz
* @see http://markmail.org/message/zn4namfhypyxum23
*/
public class SSLInfo
##################### ElasticSearch Configuration Example #####################
# This file contains an overview of various configuration settings,
# targeted at operations staff. Application developers should
# consult the guide at <http://elasticsearch.org/guide>.
#
# The installation procedure is covered at
# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html>.
#
# ElasticSearch comes with reasonable defaults for most settings,
@gm3dmo
gm3dmo / gelfsender.sh
Last active November 16, 2023 04:47
Send a log message to a gelf server using the shell.
# This script can be used to raise a graylog2/gelf message
# gzip it and send it to a graylog server using netcat (nc)
hostname='gelftester'
short_message='test message short version'
full_message='longer test message. dont\n worry be happy'
level=1
facility='gelftester'
# gnu date
date=$(date +'%s.%N')
@jirutka
jirutka / rules-both.iptables
Created September 18, 2012 12:42
Basic iptables template for ordinary servers (both IPv4 and IPv6)
###############################################################################
# The MIT License
#
# Copyright 2012-2014 Jakub Jirutka <jakub@jirutka.cz>.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
@cedricwalter
cedricwalter / firewall.sh
Created January 27, 2012 20:43
Restrictive Iptables Based Firewall for Webserver script
#!/bin/bash
# Restrictive Iptables Based Firewall for Webserver script
# Copyright (C) 2012 Cédric Walter - www.waltercedric.com
# Credits to all various authors
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.