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The Latest from ComputerNetworkingHelp
Speed up your Internet with TCP/IP "tweaking", fact or fiction? PDF Print E-mail
Written by CCIE9277   
Friday, 03 February 2006

With tons of advertisements out there promising better Internet connection performance by "tweaking TCP/IP" its hard to know what is real and what isn't. In this article I will briefly discuss some methods of changing the core settings in the TCP/IP protocol stack and what if any benefit that you will get from doing so.

First off TCP/IP means anything and everything related to the two protocols (TCP Transmission Control Protocol) and IP (Internet Protocol). Per RFC 1180 (A TCP/IP Tutorial) "It can include other protocols, applications, and even the network medium. A sample of these protocols are: UDP, ARP, and ICMP.  A sample of these applications are: TELNET, FTP, and rcp.  A more accurate term is "internet technology".  A network that uses internet technology is called an "internet"." So this is the protocol stack that makes communications over the Internet possible. That being said it would make sense that being able to "tweak" such a stack for your specific connection and the newer technologies would speed up your connection right?

Lets take a look at some of the common parameters of the TCP/IP stack that some claim can make a difference:

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Finding the right equipment for your home wireless network PDF Print E-mail
Written by CCIE9277   
Thursday, 02 February 2006

To follow up on the "So you're ready to build a wireless LAN in your home?" article I decided to write this article on finding the right equipment for your home wireless network. In the last article we covered basics on wireless terminology, protocols and equipment. Now we will take what we learned there and apply that to what we need to buy to accomplish what we want our WLAN to have the ability to do.

The first thing we need to decide is what our WLAN requirements will be. In this particular scenario we will use a desktop computer currently located in the area where there is already a DSL broadband connection connected directly to the desktop PC. Now, recently we purchased a laptop computer with built in 802.11g Wi-Fi capability and we wish to share our current broadband Internet connection between the two simultaneously. We also want to have the ability to share files between them and for the laptop to have access to a printer attached directly to the desktop computer.

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Using a VPN to secure an enterprise wireless network PDF Print E-mail
Written by CCIE9277   
Tuesday, 31 January 2006
In this article I will discuss a fairly complex but secure campus WLAN design that could be deployed in an enterprise environment.

One of the primary concerns with running wireless networks today is data security Traditional 802.11 WLAN security includes the use of open or shared-key authentication and static wired equivalent privacy (WEP) keys. Each of these elements of control and privacy can be compromised. WEP operates on the data link layer and requires that all parties share the same secret key. Both 40 and 128-bit variants of WEP can easily be broken with readily available tools. 128-bit static WEP keys can be broken in as little as 15 minutes on a high traffic WLAN because of an inherent shortcoming in the RC4 encryption algorithm. Using the FMS attack method theoretically you can derive a WEP key in a range from 100,000 to 1,000,000 packets encrypted using the same key.

While some networks can get by with open or shared key authentication and statically defined WEP encryption keys it's not a good idea to rely on this amount of security alone in an enterprise network environment where the prize could be worth the effort to a would be attacker. In this case you will need some sort of extended security.
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Securing a Linksys WRT54G Wireless-G Broadband Router PDF Print E-mail
Written by CCIE9277   
Monday, 30 January 2006
 Straight out of the box wireless routers come with many default settings that are very unsecure. Certain steps need to be taken in order to secure your wireless network. In this instance I will be explaining how to secure a Linksys WRT54G Wireless-G Broadband router. To secure your Linksys WRT54G Wireless-G Broadband router follow the steps listed below:

NOTE: This tutorial is based on the Linksys WRT54G Wireless-G Broadband router

First put the following into the address field of your browser: http://192.168.1.1

You will be prompted for a username and password, you will need to put in admin for both and you should be sent to the setup page in figure 1.

 
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So you're ready to build a wireless LAN in your home? PDF Print E-mail
Written by CCIE9277   
Monday, 30 January 2006

So you're ready to build a wireless LAN in your home? Not sure where to begin? I think I can help out a little.

First off, what is a WLAN (Wireless Local Area Network)?

Its a group of networked devices in a close physical proximity of each other connected by means of wireless communications.

Wi-Fi is a marketing term used to describe products that conform to the 802.11 wireless communications standard. Most 802.11 wireless networking equipment that can be purchased on the market today will be Wi-Fi certified.

The three popular wireless standards today are 802.11a, 802.11b, and 802.11g. 802.11a is typically more expensive and used primarily in the business world.

802.11a runs on a higher frequency than 802.11b and that makes the range a little shorter and more difficult for the signals to  penetrate walls and other obstacles. 802.11a runs up to 54 Mbps in speed and signals in a regulated 5 GHz range.

802.11b is more suitable for home networks because the range is greater than 802.11a and the signals are less easily obstructed but only runs at speeds around 11 Mbps.

802.11g is the newer standard that combines some of the attributes of both 802.11a and 802.11b. 802.11g supports speeds up to 54 Mbps but unlike 802.11a it uses the 2.4 Ghz frequency for greater range more like 802.11b. Unfortunately lots of household appliances also use this range making signal interference more common on this unregulated signal frequency. 802.11g has backwards compatibility with 802.11b such that an 802.11g wireless router or access point would allow connections from 802.11b devices as well as 802.11g devices.

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What is a Denial of Service (DoS) attack? PDF Print E-mail
Written by CCIE9277   
Thursday, 12 January 2006

What is a Denial of Service (DoS) attack?

Well, its the most common form of security attack, the easiest to perform and the hardest to track down and stop. A DoS (Denial of Service) attack by design sends a large enough amount of traffic to a host, group of hosts or network in order to overwhelm the target such that it cannot properly respond to legitimate traffic.

Below is a list of common DoS attacks:

  • Teardrop attack: Causes TCP/IP fragmentation reassembly code to improperly handle overlapping IPs.
  • Birthday attack: Based on the "birthday paradox" that more than two people in a group of 23 will share the same birthday is greater than 50 percent the birthday attack is a class of brute force attacks used to solve a class of cyrptographic hash functions problems in hopes of producing a hash collision.
  • CPU Intensive attack: Used to tie up systems resources by using viruses or trojan programs to disable systems.
  • Ping of Death: ICMP echo request of larger than 65535 that causes an input buffer overflow in certain systems.
  • DNS Poisoning: The act of exploiting a DNS server in order to make it return an invalid IP address to a name service request.
  • E-Mail attack: Designed to send so much mail to an inbox that it fills up with bogus e-mail to the point that legitimate email cannot be sent or received.
  • TCP Syn Flood: Opens up a large number of random TCP ports to the point that the host uses many CPU cycles to compute bogus requests.
  • Read more...
     
    Tip: Speed up windows! PDF Print E-mail
    Written by User Submitted: Scribby   
    Wednesday, 04 January 2006

    Found this out a while ago, its quite good after using some memory eating software or something else that seems to make your computer go slow after running it.

    Goto Start -> Run -> type "Rundll32.exe advapi32.dll,ProcessIdleTasks"

    It will run for a bit then your computer should run alot faster.

    I also made a batch file for it.

    just goto notepad and create a file and call it something.bat

    Enter the following text into it and save.

    @echo off
    echo All Idle Processes Are Currently Being Processed.
    echo Please Wait....
    Rundll32.exe advapi32.dll,ProcessIdleTasks
    cls
    echo All Idle Processes Have Been Processed.
    pause

     
    Introduction to Border Gateway Protocol (BGP) PDF Print E-mail
    Written by CCIE9277   
    Wednesday, 04 January 2006

    When routing full Internet tables which can hold more than 90,000 routes you need to rely on a very robust and highly scalable routing protocol. BGP (Border Gateway Protocol) is an interautonomous system routing protocol. An autonomous system would share common administration and routing policies inside of a network or group of networks. BGP is becoming the standard routing protocol for ISPs (Internet Services Providers) replacing the older EGP (Exterior Gateway Protocol). ISPs use BGP to route between other providers and or customer networks also running BGP. Many times ISP customers with use an IGP (Interior Gateway Protocol) to route their interior networks and will also sometimes use it to exchange routes with their ISP. If BGP is used inside of an AS (autonomous system) its referred to as IBGP (Interior Border Gateway Protocol) but when its used to route between AS (autonomous systems) its referred to as EBGP (External Border Gateway Protocol).

    In order to handle large Internet routing tables BGP must use attributes in order to maintain stability and define routing policies. BGP also makes use of CIDR (classless interdomain routing) in order to reduce the size of the routing tables by using Supernets. By using Supernets many routes can be summerized into larger route blocks shaving down the size of the routing updates and routing tables tremendously.

    Read more...
     
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