Monday, June 25, 2012

How to Set Port Security on a Cisco Catalyst Switch

If you want to ensure that only a certain device—for example, a server—is plugged into a particular switch port, you can configure the MAC address of the server as a static entry associated with the switch port.

Configure port security
Configuring the Port Security feature is relatively easy. In its simplest form, port security requires going to an already enabled switch port and entering the port-security Interface Mode command. Here’s an example:
Switch# config t

Switch(config)# int fa0/22

Switch(config-if)# switchport port-security ?

aging Port-security aging commands
mac-address Secure mac address
maximum Max secure addresses
violation Security violation mode

Switch(config-if)# switchport port-security


By entering the most basic command to configure port security, we accepted the default settings of only allowing one MAC address, determining that MAC address from the first device that communicates on this switch port, and shutting down that switch port if another MAC address attempts to communicate via the port. But you don’t have to accept the defaults.

You can also configure port security on a range of ports. Here’s an example:
Switch)# config t

Switch(config)# int range fastEthernet 0/1 - 12

Switch(config-if)# switchport port-security

However, you need to be very careful with this option if you enter this command on an uplink port that goes to more than one device. As soon as the second device sends a packet, the entire port will shut down.

View the status of port security

Once you’ve configured port security and the Ethernet device on that port has sent traffic, the switch will record the MAC address and secure the port using that address. To find out the status of port security on the switch.

Switch# show port-security address

Disabling Port Security in Cisco Switch

Now we will see an example how to disable port security in cisco security.We have configured fa0/22 for port security now if you want to disable port security follow these steps
Switch# config t

Switch(config)# int fa0/22

Switch(config-if)# no switchport port-security

Switch(config-if)# end

Wednesday, June 20, 2012

How to Create a LAN Connection Using an Ethernet Cable?

Having multiple computers at home doesn't mean you need to have multiple Internet connections. If you have a router and a few Ethernet cables, you can share an Internet connection among all your computers and even transfer files between them without having to use a CD, floppy disk or jump drive.

What you need to create a LAN connection using an Ethernet cable is Router Ethernet cables

How to Create a LAN Connection Using an Ethernet Cable? Follow these steps:
1. Insert the software disc that came with your router into your computer's CD or DVD drive. Follow the on-screen instructions to install the software.

2. Plug the AC power cable from the router to an electrical wall outlet. Connect an Ethernet cable from the port on the router that says either "WAN" or "Internet" to the outgoing port on your broadband modem.

3. Connect an Ethernet cable from the Ethernet port on the back of your computer to one of the open ports on the router. 

4. Run Ethernet cables from any other open port on the router to any other computers you want to be added to the network.

5. Click on the "Start" bar at the bottom of your desktop and then choose the "Control Panel" button. Click on the link that says "Network Sharing Center" and then click on the button that says "Set up A Network Connection."

6. Check the radio box that is marked "Connect to the Internet through a gateway" and then click "Next." Type in a name for your network and then hit "Next" again. Press "Finish" to set up the network.

7. Go to the other computers on the network and navigate to the Control Panel again and then choose the Network Sharing Center. Click on "Connect to a Network" and then choose the network you set up on the first computer.

Tips & Warnings
It doesn't matter which open port you use on the router to connect an Ethernet cable to your computer, as long as you don't connect it to the "WAN" port reserved for the modem.

Keep the Ethernet cable in an area where it can't be tripped over or accidentally pulled out. Running it across the ceiling or on top of a wall using tape or a cable runner will keep the cords out of the way.

Monday, June 18, 2012

Cisco Wireless, Access to Information and Resources in Wireless Networks

Cisco wireless solutions ensure that your business is able to react to the constant demands of the fast moving global economy. And the Cisco Unified Wireless Network helps enable the Borderless Mobility Experience with a broad portfolio of products that provide anywhere, anytime access to information with the same quality of experience provided by a wired network.

For every Cisco fans, they are familiar with all the Cisco wireless products, such as Access Point, Client Adapters and Client Software, Antennas, Wireless LAN Controller, Wireless Integrated Switches and Routers, Wireless LAN Management, Outdoor Wireless, Mobile Wireless, Service Control for Mobile Networks, Wireless IP Telephony, etc.

Firstly, let’s get some questions that were asked by people who used Cisco wireless products
“I need drivers, and help on how to set up a Cisco Wireless Adapter? I have a Cisco Aironet 802.11a/b/g Wireless CardBus Adapter that I am unsure on how to set up. I can't find drivers for it on the cisco website, or anywhere on the web. If anyone could link me to the drivers and tell me how to set it up that would be great!”

“How do I enable the wireless in a Cisco Aironet access point? This is 1200 series Cisco systems AP which is shipped with the wireless disabled, I have only laptop at my disposal. I have tried to communicate with it using it's supplied ethernet cable but either my laptop does not see it or it does not respond. I have the small hand book that comes with it so I do know all the default settings.”

“Where can I get coupons for Linksys by Cisco Wireless-N Broadband Router? Where can I find a discount online for Linksys by Cisco Wireless-N Broadband Router?”

No matter what Cisco wireless products you have, many people will be confused with how to use it. So we can learn some basic features of Cisco wireless items to help you know it well.

Take Cisco Wireless Access Point as a typical example, Cisco Aironet access points and bridges connect wireless devices to networks, providing ubiquitous network access for indoor and outdoor environments. Cisco's next-generation wireless solutions offer comprehensive wireless coverage with up to nine times the throughput of 802.11a/b/g networks. Cisco enterprise wireless mesh helps enable cost-effective, scalable deployment of highly secure indoor and outdoor wireless LANs.

Overview on some popular Cisco wireless Products
CiscoAironet 1250 Series Wireless Access Points built on a robust modular platform designed for easy field upgrades, facilitating support of a variety of wireless capabilities
including data rates of 300Mbps per radio while providing reliable and predictable WLAN coverage.

Cisco Aironet 1140 Series Draft N Access Points give six times the performance of 802.11a/g networks for reliable connections to Wi-Fi voice, streaming video, and business applications. Cisco Aironet 1140 Series indoor access points have a sleek design that blends into enterprise environments, and they can be powered with standard 802.3af Power over Ethernet.

Cisco Wireless LAN Controllers (Standalone and Modules), simplify the deployment and operation of wireless networks, ensuring smooth performance, enhanced security, and maximum network availability. Cisco wireless LAN controllers communicate with Cisco Aironet access points over any Layer 2 or Layer 3 infrastructure and support 802.11a/b/g and the IEEE 802.11n draft 2.0 standard.

Notes: More info such as price, purchasing info, feature details and specs of Cisco wireless products you can visit Wireless, or go to Cisco’s official site see more wireless solutions and services.