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  • FTTH and Gigabit Ethernet in real life

    30 décembre 2015 ( #NETWORKS )

    FTTH is a coming to our homes. Let's see what to expect in real-life, and the caveats to look for. In this article we'll see : . a Gigabit Ethernet performance guide : understanding and using Gigabit Ethernet . the testing and evaluating of the FTTH Internet...

  • NAS 1 : DLink DIR 626L

    12 juin 2014

    This serie will explore NAS technologies, and the related issues. This first part will study the NAS functions of the DIR-626L, a neat 40 $/€ featurefull Router, with complete IPv6 capabilities. The DIR 626-L Firmware tested here is : FW v1.03 The SharePort...

  • VPN 3 : PPTP setup

    01 octobre 2013 ( #VPN )

    We'll see here how to setup PPTP for real use, covering issues like Wan access, port forwarding, and PPTP passthrough. We'll use a Cisco Small Business RV110W as a VPN server, Debian 7.5 LXDE as VPN client, and a DLink DIR-626L to test PPTP Passthrough....

  • VPN 4 : Debian PPTP Server w/ IPv4 and IPV6

    03 octobre 2013 ( #vpn, #ipv6 )

    This post will explain how to setup a PPTP server that is able to transport both IPv4 and IPv6, using Raspbian as the server, and how to setup a Debian or Windows 8 client. ( The setup is the same for Debian or Ubuntu as the server ). The tunnel will...

  • VPN 5 : PPTP server hiding - change the default port

    04 octobre 2013 ( #VPN, #PPTP )

    I'll briefly explain an easy tip to change the default TCP 1723 port of a PPTP server. Port TCP 1723 being an easy target for network scanners, it may prove usefull to change the PPTP server listening port to a private-range port, well hidden in the dark....

  • Layer 2 networking Part 1 : The Data-Link Layer

    28 juillet 2014 ( #NETWORKS )

    This serie will focus on the Layer 2, and explore : 1. The Data link layer 2. The Ethernet Family and 802.x 3. Wifi detailed and wiresharked 4. Bluetooth tethering, using bridging and using routing 5. Spanning Tree Protocol, using a Linux STP switch and...

  • Layer 2 networking Part 2 : Ethernet and the 802.x Family

    28 juillet 2014 ( #NETWORKS, #Layer2 )

    We'll be seeing here Ethernet, and the great 802.x Family. 1. Introducing the Ethernet Family Ethernet is a technology based on shared medium usage. Its foundation is CSMA/CD ( Carrier Sense Multiple Access with Collision Detection ). There are actually...

  • VPN 12 : Setting up a Debian Public Key Infrastructure

    14 octobre 2013 ( #VPN, #PPTP, #OPENVPN )

    We'll be seeing here how to setup a Public Key Infrastructure, using Debian, with some explanations about the different terms and options used. 1. PKI quick reminder We'll be creating : a master Certificate Authority (CA) certificate and private key,...

  • VPN 1 : Basis and theory

    24 septembre 2013 ( #VPN )

    We'll lay down here some basis for fully understanding and using VPN technologies. This post will be augmented, if some new basis are needed. VPN Basically, VPN makes use of tunnels, to join together several distinct networks, or to allow a remote user...

  • VPN 8 : A PPTP wifi-hotspots usability survey

    10 octobre 2013 ( #VPN, #PPTP )

    This study is about the practical usability of PPTP using public wifi-hotspots ( Libraries, cafes, ..) and consumers networks ( Friends networks, ... ) It is widely known that the GRE's use of PPTP makes it less reliable than pure TCP/UDP protocols like...

  • VPN 6 : iptables for your PPTP server and PPTP client

    08 octobre 2013 ( #VPN, #PPTP )

    I'll briefly detail here the iptables config for both the PPTP Server and the PPTP Client, and will outline the GRE protocol functioning and needs. Tested using : PPTP Server : Raspbian June 2014 PPTP Client : Debian 7.5 LXDE Last Edited July 27 2014...

  • VPN 7 : PPTP server protection with Fail2ban

    09 octobre 2013 ( #VPN, #PPTP )

    We'll see here how to protect our PPTP server with Fail2BAN, to suppress brute-forcing attacks. The OS used is RASPBIAN, but this should work with any Ubuntu or Debian variants. Fail2ban monitors the system logs for failed login attemps, and dynamically...

  • VPN 11 : SSH with Public-Key Authentication

    12 octobre 2013 ( #VPN )

    We'll see here how to upgrade a SSH server security by using Public-Keys. Raspbian and Debian OS are used here. Ubuntu will function the same too. SSH Server OS : Raspbian June 2014 SSH Client OS : Debian 7.5 Last edited July 28 2014 1. Security benefits...

  • IPv6 Address types

    27 mai 2013 ( #IPv6 )

    When first encountering IPv6, one of the first questions that pops up to mind is : What are the address spaces, what have become of my private address ranges ( 10./8, 172.16./12 and 192.168./16 ). We will quickly review the addressing ranges of IPv6....

  • Static IPv6 Networking

    28 mai 2013 ( #IPv6 )

    In this article, we'll study a basic, static IPv6 networking. We'll use two computers and a switch. You can use any Vista, Seven, 8, Windows Server 2008, 2008 R2 or 2012 for this lab of course, you don't need a server OS. Here is the Network Map we will...

  • Static IPv6 Networking part 2 : An IPv6 Router

    01 juin 2013 ( #IPv6 )

    For this second step in IPv6 static networking, we will put in place an IPv6 router, to be able to route two ULA ( Unique Local Address ) subnets. The network map is this : We use the same ULA Network ID as the last post, RFC 4193 Compliant. The Client...

  • Static IPv6 Networking Part 3 : 2 Routers setup

    05 juin 2013 ( #IPv6 )

    For this next part in the Static IPv6 Networking serie, we're going to complicate our network topology a little bit more. We will chain 2 IPv6 Routers, so to route 3 ULA subnets. We'll see how to make an IPv6 Router out of a Windows computer, in case...

  • Static IPv6 Networking Part 4 : Route Aggregation

    10 juin 2013 ( #IPv6 )

    There are at least several reasons to comply to RFC 4193. The first one is for futur sites mergings ( see previous post ), as well as security : a pseudo random network ID will make it harder for local worms to crawl your ULA network. That's typical '...

  • Static IPv6 Networking Part 5 : Internet Connectivity

    11 juin 2013 ( #IPv6 )

    We will see now, in this serie about Static IPv6 Networking, how to bring and use Internet Connectivity, ie Global Unicast addresses. As ISPs have different ways of setting up IPv6 connectivity to the CPE, we'll use Hurricane Electric tunnel. It's free,...

  • IPv6 Static Networking Part 6 : DNS for Internet Access

    15 juin 2013 ( #IPv6 )

    As we're getting into the Global Internet connectivity, we need to spend a little time talking about DNS. Because without correct DNS functionning, there is no name resolution, and thus most computer softwares are stalled ( Web browser, Mail client, Antivirus...

  • Static IPv6 Networking Part 7 : Internet connectivity to a whole subnet

    16 juin 2013 ( #IPv6 )

    For this next part, we're going to see how to bring IPv6 internet connectivity to a whole subnet. For this, we will need an IPv6 capable Router, or to use a Windows PC as an IPv6 Router. We'll see both ways to do this. The basic network topology looks...

  • Static IPv6 Networking Part 8 : Internet Connectivity with a routed /48

    19 juin 2013 ( #IPv6 )

    In this last post about IPv6 Static Networking, we'll breifly see how to use a routed /48 network, and how to disignin its subnets. See the previous posts for basics like turning a Windows OS PC into an IPv6 router, basic IPv6 routing, creating a Hurricane...

  • Dynamic IPv6 Networking part 1 : Basis and Default Gateway

    27 juin 2013 ( #IPv6 )

    We'll see the precise basis needed to understand the IPv6 dynamic networking shift, and see the most important consequence : Default Gateway advertisement. We'll see how to configure a network router or a Windows OS router to be an advertised default...

  • Dynamic IPv6 Networking Part 2 : Route advertisement

    28 juin 2013 ( #IPv6 )

    After having seen IPv6 default gateway advertisement in the previous post, we will now have a look at IPv6 route advertisement. Effectively, RA ( Router Advertisement ) provides a way for hosts and routers to announce and publish known routes. Let's see...

  • Dynamic IPv6 Networking Part 3 : DHCPv6

    28 juin 2013 ( #IPv6 )

    DHCPv6, also named statefull DHCPv6, is very similar to DHCPv4. It allows full control of address attribution, and full hosts configuration ( IPv6 address, prefix length, DNS servers, DNS prefix, NTP servers, ... ). Remember that DHCPv6 won't hand out...

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