Networks Analyzed @ Netralized

After configuring your switch with Vlans you notice that something is wrong.

I will give you a simple guide to troubleshoot Vlans and make things work again.

• First check for Layer 1 and Layer 2 issues
• Is the cable plugged into the correct port?
• Is the link light on, and if so, what color is it? (If the led has a green color, it means that the switch port is in the forwarding state, if the port led has a yellow color the port is in the blocking state and if the port has a yellow blinking led, it is in the error state.
• We can use the Switch# show interface command to confirm link state
• Check the duplex mode

(more…)

If you Like this Article, Share it!

With this article I will go you through the configuration of enabling the web interface of your router.

Before showing you the commands, that are quite simple, I will explain what we will achieve with them.

Enabling an HTTP server on the router allowing the administrator by using any web browser to configure the router by pointing to the IP address of the server.

Syntax of the Commands:

Router(config)#ip http server

Now if you wish to enable the web interface in a non default port (The default port is 80) you can use the following command:

Router(config)#ip http port [port number]

(more…)

If you Like this Article, Share it!

Voice over IP (VoIP) is a major networking application and nowadays is appearing everywhere. VoIP is running over common high speed connections as: Ethernet, Frame Relay, ISDN, ATM, DSL, Cable and other.

With the VoIP technology we can transmit the analog voice signals of our telephone, through the traditional data network. This technology works by encoding analog voice signals into IP packets. These packets are sent across the data network and reassembled and decoded at the other end back to analog signal.

(more…)

If you Like this Article, Share it!

If you want to discover all the active hosts on your subnet from your routers console, you can perform a ping in the broadcast address of your subnet. Keep in mind that all the active nodes on your subnet should respond to that ping. As a tip I can tell you that this kind of ping will only work in privileged exec mode.

For example if you use the subnet 10.1.1.0 /24 the broadcast address is 10.1.1.255

From privileged mode perform a ping like this:

Router#ping 10.1.1.255

A “list” with all the active nodes should appear.

Another command that you can use to find out with witch hosts has the router communicated is

Router#show ip arp

You can use this useful type of ping for many types of things, for example to check how many computers are connected on a wireless network. Till our next article, stay tuned.

If you Like this Article, Share it!

In this article I will give you three useful commands for setting up your router’s clock.

If you are wondering why the router’s clock is important, just think the syslog messages. Every syslog message has the time that the event occurred. Imagine a hacking attempt that has been tracked by your syslog, if the clock of your router is not configured properly, you can’t find out when the attack took place.

Now let’s start with the commands.

Clock set

Clock set hh:mm:ss day month year

This command manually sets the router’s clock. The time is specified in terms of a 24 hour clock and the year must be in a four digit notation for example 2000.

(more…)

If you Like this Article, Share it!

Hello again, after getting some feedback from the Computer Problems article, i thought i should write an article about the next big decision you will have to make.

Situation is like this: You’re enjoying with your afternoon with your friends having fun. Your cellphone rings and once again it’s the mr. IWontSpendAMinuteFixingMyComputerCauseIKnowPeopleWhoWillDoItForMe, starting once again the usual conversation:

(more…)

If you Like this Article, Share it!