Daniel Law iDanielLaw

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.

Categories:

• Routing Encapsulation
• GRE
• IPIP
• Choosing a Protocol
• Setting up
• Troubleshooting

This example shows vxlan nat traversal, using UDP hole punching.

         +---------------+
         | (node5) vxlan |
         +---------------+
                  | uplink
       +--------------------+
       | (node4) masquerade |
 +--------------------+

	/*
	* Generic hashmap manipulation functions
	* SEE: http://elliottback.com/wp/hashmap-implementation-in-c/
	*/

	#ifndef __HASHMAP_H__
	#define __HASHMAP_H__

	#define MAP_MISSING -3 /* No such element */
	#define MAP_FULL -2 /* Hashmap is full */

	<?php
	/**
	* Catch php output buffering data over jQuery AJAX
	*
	* @author: Sohel Rana ([email protected])
	* @author url: https://blog.sohelrana.me
	* @link: https://blog.sohelrana.me/catch-php-output-buffering-data-jquery-ajax/
	* @licence MIT
	*/

	package main

	import (
	"crypto/tls"
	"encoding/json"
	"fmt"
	"log"
	"net"
	"net/http"
	)

	package main

	import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/tls"
	"crypto/x509"
	"crypto/x509/pkix"
	"errors"
	"log"

	#!/bin/bash
	# This script will help you setup Docker for TLS authentication.
	# Run it passing in the arguement for the FQDN of your docker server
	#
	# For example:
	# ./create-docker-tls.sh myhost.docker.com
	#
	# The script will also create a profile.d (if it exists) entry
	# which configures your docker client to use TLS
	#

	#!/bin/bash -e

	function run-vg-cmd() {
	pushd $1
	eval $2
	popd
	}

	function usage() {
	echo "Usage: $0 container from-vagrant-dir to-vagrant-dir"

	config setup
	charondebug="ike 2, knl 2, cfg 2, net 2, esp 2, dmn 2, mgr 2"

	conn %default
	# keyexchange=ikev2

	conn mikrotik-1
	# Try connect on daemon start
	auto=start