Introduction To Wireless Network

For Introduction of Wireless Communication and WLAN
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Mesh Network

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Presentation Of Mesh Network Understanding
Mesh Network Presentation

VPN Tips and Tricks

1. Start with a PPTP connection and test. Then change from PPTP to L2TP or IPSec without authentication or encryption. Finally add the authentication and encryption.
   
   
2. ALL Teleworker IPSec profiles use the same Pre-shared Key and IPSec parameters, which are entered on the "VPN and Remote Access Setup > VPN IKE / IPSec General Setup" page.
   
   
3. LAN-to-LAN VPN profiles to static IP addresses MUST use unique passwords or Pre-shared Keys.
   
   
4. LAN-to-LAN VPN profiles to Dynamic IP addresses also use the common Teleworker Pre-shared Key and IPSec parameters, which are entered on the "VPN and Remote Access Setup > VPN IKE / IPSec General Setup" page.

Cleaning Computer Components

• General cleaning tips
  

• Cleaning tools
  

• Case cleaning
  

• CD-ROM cleaning
  

• CD cleaning
  

• Floppy drive cleaning
  

• Headphones cleaning
  

• Keyboard cleaning
  

• LCD cleaning
  

• Monitor cleaning
  

• Motherboard cleaning
  

• Mouse cleaning
  

• Printer cleaning
  

• Scanner cleaning
  

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Network Tools

• SmartWhois - Quickly resolve IP addresses and host names, get administrator contacts, country, city etc.


• TraceRoute - Test the route to a certain server or IP address on the Internet, find out about intermediate devices.


• Ping - Test responsiveness of a remote computer.


• NsLookup - Resolve a hostname to an IP address and vice versa.


• Proxy Test - If you want to stay anonymous on the Internet, check how good your proxy hides real data.


• Bandwidth Meter - Test the speed of your Internet connection.


• Environmental Variables Test - Check your remote variables that are used to inform and customize programs

Wireless Hacking

1) Stations and Access Points

2) Channels

3) Wired Equivalent Privacy (WEP)

4) Wireless Network Sniffing

5 ) Passive Scanning

6) Detection of SSID

7) Collecting the MAC Addresses

8) Collecting the Frames for Cracking WEP

9) Detection of the Sniffers

10) Wireless Spoofing

11) MAC Address Spoofing

12) IP spoofing

13) Frame Spoofing

14) Wireless Network Probing

15) AP Weaknesses

16) Trojan AP

17) Denial of Service

18) Jamming the Air Waves

19) War Driving

For Datail:Click Here

OFDM Technology

The WIMAX OFDM waveform offers the advantage of being able to operate with larger delay spread of the NLOS environment.

The OFDM waveform eliminates the (ISI) problems and the complexities of adaptive equalization.

OFDM technology provides operators with an efficient means to overcome the challenges of NLOS propagation.

Recent international standards such as those set by IEEE802.16,ETSI BRAN and ETRI,have established OFDM as the preferred technology of choice.

It is easier to equalize the individual OFDM carrier than it is to equalize the broader signal carrier signal.

System Diagnostic

Check the RF Communication
-Registration/Association
-Signal Strength and Quality
-Link Speed
Check the IP Configuration
-Network Address/Mask
-Routing, Default Gateway
-Ping, Traceroute

Vista Network Tips

Printer Sharing

Change Workgroup

Change Computer Name

Unidentified Network

WISP Topology

Point to point links
(+) longer distances (max 30-40km)
(-) higher cost/client
Point to multipoint links
(+) serving multiple clients at lower cost/client
(+) larger area of coverage
(-) lower range (max 5-12km)

Base Unit Configuration

1.Connect the Antenna

2.Connect the Ethernet Cable

3.Connect the RS-232 Console Cable

-Use Terminal Emulation Program on your Laptop or Desktop PC

4.Connect the Power Supply

5.Power the unit on

Backup / Restore the Registry

To Backup/Restore the Windows Registry: Windows 9x For XP 2000 click here

1. If you are in MSDOS, at the C:\Windows prompt type


2. Attrib -s -r -h C:\Windows\System.dat (press Enter)


3. Attrib -s -r -h C:\Windows\User.dat (press Enter)
   

To make the backup copies type:

1. copy C:\Windows\System.dat C:\Windows\System.000 (press Enter)


2. copy C:\Windows\User.dat C:\Windows\user.000 (press Enter)
   

To Restore the Registry

1. copy C:\Windows\System.000 C:\Windows\System.dat (press Enter)


2. copy C:\Windows\User.000 C:\Windows\user.dat (press Enter)

Windows backup tips

1. Backup and restore functions in Windows: Advantages and limitations
   Windows has several built-in data protection mechanisms -- NT BACKUP, Automated System Recovery, Device Driver Rollback and System Restore – plus Data Protection Manager. In this tip, Brien M. Poesy looks at the advantages and disadvantages of each.


2. Why DPM is replacing traditional disk-to-tape backups
   In many organizations, disk-to-disk-to-tape backup is replacing the traditional disk-to-tape backup systems that have been the standard for disaster recovery for many years. A big part of that reason is Microsoft's backup and replication product, Data Protection Manager (DPM).


3. Backup failure: Five reasons backups fail
   Media failure, human error and hardware failure are among the most common reasons backups fail. Learn what you can do to prevent failures resulting from these issues.


4. Four ways to increase the lifespan of your backup tapes
   Tape doesn't last forever. If you have critical archival data that must be maintained for a while, here are some tips on increasing the lifespan of tape.


5. USB drive backup: Pros and cons
   There are good reasons for Windows administrators to use external USB drives for backup. There are also reasons not to.


6. Install backup on Windows XP Home Edition
   Although the Backup utility is not mentioned at any point during the default installation of Windows XP Home Edition, it is included. However, you need to do a manual install to prepare it for use.


7. CDP not always a substitute for conventional backup
   Continuous data protection (CDP) technology may be the hot backup technology, but it doesn't fulfill every enterprise backup function, particularly when it comes to archival storage.


8. Backup tape encryption grows up
   Backup tape encryption technology has come a long way and offers security you wouldn't have otherwise. Here's advice on how to encrypt your backup tapes more efficiently.


9. Worst practices for backup and disaster recovery, Part 1
   Even when network administrators are aware of the need for a solid data backup and recovery plan, too many companies observe worst practices, thereby dooming the plan.


10. Like life, the best things in backup are 'free'
    When it comes to discussing backup architectures, the word "free" pops up a lot. There's server-free backup, LAN-free backup and SAN-free backup. The question for you is, which one of these "free" backup architectures is best for your storage set-up?

VPN Category

For secure VPNs:

• General IPsec


• ESP and AH (encryption and authentication headers)


• Key exchange (ISAK MP, IKE, and others)


• Cryptographic algorithms


• IPsec policy handling


• Remote access


• SSl and TL'S
  

For trusted VPNs:

• General MP LS


• MP LS constrained by BGP routing


• Transport of layer 2 frames over MP LS


• Virtual routers