Posted by Internet at Every Where on 6:33 PM
I found the following handy Cisco commands are very useful for initial configuration of Cisco devices.I always use these commands to configure Cisco devices from fresh configuration.router> enablerouter> configure terminalrouter (config)# no ip domain-lookupThe no ip domain-lookup is very useful, what this command does is tell the Cisco device not to do a domain lookup when you mistype something in the CLI. For example if you do this without the no ip domain-lookup:router# pignTranslating "pign"... domain server (255.255.255.255)%unknown command or computer name, or unable to find computer addressThe Cisco device will try to find the computer name of pign, it doesn't know that you mistyped ping. This process could take a very long time.If you apply the no ip domain-lookup, the Cisco...
Posted by Internet at Every Where on 6:35 PM
There are many handy Cisco commands that you can use to help you in configuring Cisco devices, these commands well not exactly secret commands but you might not get it from the CCNA curriculum.One of these handy commands I already posted it at my previous post. But I want to cover it again in case you missed the post.This one is the interface range command. What this command does is to select a range of interfaces and apply the same commands to them.This is very handy especially in a Cisco switch environment where you might want to set some ports to be access ports or apply the same security to those ports instead of doing it one by one for each...
Posted by Internet at Every Where on 4:14 AM
That was what I concerned when first building my Cisco home lab. I never concerned about this before since I only had my laptop, couple of PCs and the good old Linksys networking devices.No matter what devices I have, I should have installed some lightning and surge protection for any electronic devices I have.Lightning, power surges and spikes are the main enemy of electronic devices. Lightning can cause a major power surge and spike, meaning when a lightning strikes it causes a brief huge power spike which can reach a spike of 50 million volts, it's brief but deadly.And not only surges from lightning, if you live in some old neighborhood, sometimes...
Posted by Internet at Every Where on 7:24 PM
Ever wonder how to build your very own wifi hotspot? If you followed my previous posts, I hope you manage to build your own home network and that is suffice for the first step in building wifi hotspot.Next things to consider are how to manage your network, you certainly don't want anyone just joining your wireless network right? that is if you don't want to build free for all hotspot.You also don't want people eating all your bandwidth, somehow you need to limit the hotspot users, and limit their access so they won't be able to join your internal LAN.If you want these features in your hotspot, you probably going to need something that is called...
Posted by Internet at Every Where on 7:10 AM
The last post I talked about configuring WEP authentication on Cisco Aironet wireless access point.Now I want to configure WPA and WPA2 to give more strength in the wireless security.Just for a note I put an image of padlock on the last post and now I give a picture of a vault to give the image of stronger security.You know what I mean, padlock versus vault, oh just forget it.Back to the topic, when first posting about WEP I said that WEP encryption is weak, you better use encryption like WPA and WPA2.WPA gives better key management and stronger cipher encryption. For those who don't know about cipher, it's kinda algorithm for encryption and...
Posted by Internet at Every Where on 5:31 PM
The wireless network you installed for your LAN can mean that you are directly exposing your network to the public.Anyone can use a wireless sniffer and view all the traffics going between the wireless access point and the clients. That's why you need to add security in your wireless LAN.This post will talk about WEP or Wired Equivalent Privacy, the name states that your wireless network will be as safe as your wired network but not in reality.There are many WEP decryption tools available out there. Just capture some packets using wireless sniffer and use the the decryption tool to find out the WEP key.So we know the WEP is not secure, nevertheless...
Posted by Internet at Every Where on 9:06 PM
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Posted by Internet at Every Where on 5:50 PM
Now it's time to configure Cisco Aironet Wireless Access Point for Cisco home lab.What I'm going to do first is to configure the connectivity between the Cisco Aironet 1240AG wireless access point to the Cisco 2950 switch.Here's the closer look of the network diagram of the wireless access point and the switch:The network will be using VLAN 5 (192.168.5.0 network) as the native VLAN and the rest of the VLANs will be used for the SSIDs.There's an interface called BVI or Bridge-group Virtual Interface, what this interface does is bridge all of the interfaces in the access point - the wired and wireless interfaces - so you can use the interface...
Posted by Internet at Every Where on 6:35 PM
I've configured my Cisco home lab with a router that connects to cable internet and a switch with VLANs.Now it's time to add a new device to the Cisco home lab, a Cisco Aironet 1240AG wireless access point for wireless connection.And by the way, the image on the left is not an official logo from Cisco or anything, I just made that up.I won't configure anything fancy this time, only give basic administration configuration and set up an open SSIDs also associate the SSIDs to VLANs.Since I want to configure two SSIDs - one is free for all SSID with no authentication and the other one with authentication - for the wireless network, I need to configure...
Posted by Internet at Every Where on 5:08 AM
Congratulations Mr. Community Organizer! You beat them with the strategy they mocked.Recently, I read an excellent book about Abe Lincoln -- Team of Rivals. In order to deal with a divided nation, Lincoln chose his cabinet from the best minds available. He ended up with a cabinet composed of mostly his rivals to the presidency. He chose these men for their abilities and experience. Lincoln knew the problems he faced were too much for one person. He knew he needed a team of experts -- all more capable than him in their specialities.Lincoln was a master weaver in not only creating his team, but also managing them. A diverse team is difficult...
Posted by Internet at Every Where on 1:59 AM
At the last post I talked briefly about the wireless site survey in networking projects.Now I want to share my view in things that I personally consider in building wireless home network.The following points are just my considerations, most home or SOHO users just plug their wireless access points, configure them and they just work fine.Which Standard to UseCurrently there are four common standards for wireless networking, the 802.11a, 802.11b, 802.11g, and the latest one is 802.11n. These standards use unlicensed frequencies meaning they're all free for all to use.You can use the frequencies for your wireless networks and you can't complain...
Posted by Internet at Every Where on 5:34 PM
If you're planning to deploy wireless access points in a networking project then I congrats you, you still have lots of works to be done before you get to configuring the access points .There are lots of things to consider if you're in a networking project, the location of the access points, channels to use, are there radio interferences in the locations, etc.You need to do wireless site survey in a network project, see they even created their own science for this work.To talk about wireless site survey could take its own blogs, books, tools and even specialized certification if you want to do it properly and professionally.The tools software...
Posted by Internet at Every Where on 3:31 AM
Ah, I just love these things the Cisco Aironet Wireless Access Points, on the left one you can see the Cisco Aironet 1240AG Access Point, one among every other Cisco Aironet series.This is the very first Cisco device that I got, I thought that at least I can integrate it with my existing non-Cisco home network.1240AG is not the prettiest access point that you can get, but I like the shape anyway. It reminds me of liquor bottles that I used to see in the movies.Now why would you want to buy Cisco Aironet, it costs about ten times or more than the average home usage access points like Linksys or D-Link.These Aironet things are great, for the 1240AG,...
Posted by Internet at Every Where on 5:41 AM
If you've taken the Cisco Academy program or been in the network world for a while, you must have heard about broadcast storm.Broadcast storm is a state in a network where a frame broadcast in a switch environment is continually being flooded through the network.This is mostly happen in a switch environment where you have redundant connection between switches, remember that routers segment or isolate broadcast between networks.Redundant connections are important if you want to create a backup path between switches. If one path fails the other will take over.This won't work out with switches that don't have any loop avoidance mechanism.This is...
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