HOW-TO PING IP ADDRESS AND CHECK DNS SETTINGS

In this video tutorial you will see how to test TCP IP connection by using the ping command. Ping is the most important troubleshooting command and it checks the connectivity with the other computers. For example your system’s IP address is 10.10.10.10 and your network servers’ IP address is 10.10.10.1 and you can check the connectivity with the server by using the Ping command. 

DNS Domain Name Service, is how your computer turns an address like Google.com into an IP address it can use to connect to Google’s servers. Your Internet Service Provider (ISP) sends your router a list of DNS servers using DHCP when your modem connects to the Internet. Then your router forwards that list of DNS servers to each computer on your network, again using DHCP. We will also see how to check DNS settings.

Video Transcribed

Hi in this session, we will see how to test TCP IP connection by using the ping command.  So to test TCP IP connectivity by using the ping command, use the display of ipconfigcommand to ensure that your network command is not in media disconnected state.

So let us open command prompt and then issue this command.

To open command prompt: go click Start, go to All Programs, Accessories, and clickCommand Prompt.  Go to the root directory and then issue the command, “ipconfig” and hit enter.  You can see that IP address of my machine is 10.0.0.12 and the default gateway for my machine is 10.0.0.1.

So now let us ping the default gateway and see if we are able to read it.  To ping the gateway, write command, “ping 10.0.01” and then hit enter.  If you get reply from the IP address you’re trying to ping then you’ll surely be able to reach it.  You can also have a look at Ping Statistics for 10.0.0.1 wherein you have sent 4 packets and you have also received 4 packets.

There was absolutely 0% loss in reaching this default gateway.  There could be a possibility that your machine is not hooked on the network.  In such cases, your media adapter where it shows as media disconnected in here.  Let me unhook this machine from the network.  I just disabled the machine from the network.  I got a pop-up over here that my network cable is unplugged.

Now let me issue the same command, “ipconfig.”  See, now it says that “Media disconnected.”  Let me put it on the network, the machine is on and trying to see.  Now it is connected to my local area network.  Let me give the command again and I can see it is now connected.  Now let me try pinging Google from this machine.  So to ping Google, I issue the command, “ping www.google.com” and I’ll hit enter.  I can see that probably it is trying to ping Google but not able to read.  We’ll give some time for the machine to try and read Google.  See, it has given up and it has not been able to read Google.  What could be the reason for that?  Let us go into the network properties of this machine.

To go to network properties: click Start, go to Control Panel, open Network and Internet Connections, and then click Network Connections.  You will see the local area connection.  Right click it, go to its properties, highlight Internet Protocol (TCP/IP) and click properties.  You will see that there is a DNS server given over here, 10.0.0.10.

So whenever you try ping, say “www.google.com”, this DNS server in here will try to resolve this name to the IP address and then forward all the data packets to that IP address.  I suspect that this DNS server is not reachable from this machine.  Let try pinging this DNS server.  I’ll say “ping 10.0.0.10”, I’ll hit enter.  See, I am correct probably.

If it says, “Request timed out” which means I am not able to reach this DNS server.  So what do I do now?  I need to give an alternate DNS server which is probably up and running on my network.  I know there is another one and I’ll ping in 10.0.0.1 which is another DNS server on my network.  I’ll say “okay” and say “close.”  I can also go and see the settings from ipconfig/all and it will tell me that “okay my IP address is this…” and in DNS servers, I now have now two DNS servers in here and successfully able to ping 10.0.0.1.

So now let us try to ping Google back again and see what happens.  See, the alternate DNS address is able to translate this name into the IP address of Google.  So this is the IP address of Google, 74.125.236.84 and my data packet from this machine is able to go and ping Google.  So it is very important, even if your machine is on network and you’re trying to reach some websites and not able to reach.  The reason could be that the DNS server in between might not be accessible.  You should be having the right configuration of DNS server.  To test that, go ping the DNS servers which are listed in your ipconfig/all and see if your machine is able to reach then.

That’s pretty much it in this segment session.  You are now successfully able to know how to ping a machine and how to check if correct, maybe a resolution is happening.  If not, you can go and specify the DNS servers which are up and running and reachable from your machine.  Thanks for watching.

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HOW TO UPDATE GOOGLE CHROME TO THE LATEST VERSION

I have said it before and I will say it again…I feel that Google Chrome is the BEST software to use when browsing the internet. Not only is it fast, but in my humble opinion, it is also the most secure.

Having said that about Google Chrome being the most secure, it also needs the appropriate attention in regards to making sure that it has all security updates applied on a regular basis. The world that we live in today requires us to be very diligent in our security practices.  So make sure you update Google Chrome. This will help you keep your computer secure as it will be equipped with the latest tools.

I wanted to show you how easy it is to check for security updates in your Google Chrome internet browser.

How to update Google Chrome

1. Open Google Chrome.

2. Now look in the top right hand corner of the screen for the Wrench Icon. Actually Google calls this the Spanner icon. The definition of spanner is “A wrench”. Learn something new every day.

3. Click on the Spanner (Wrench) Icon.

4. Click on About Google Chrome.

5. The About Google Chrome dialog box is shown. It will display the current version of Google Chrome and if your Google Chrome needs updating, it will display the wording “Installing New Version“.

6. Once Google Chrome has completed installing the new updates if any, it will display the About Google Chrome dialog box once again with the wording “Relaunch Google Chrome to finish updating“.

7. Click the Relaunch button.

8. When Google Chrome has finished updating and has been restarted, you can do the above process again and it should show the updated version. It will check again for new updates but should not find any new ones to install.

Google Chrome Security update releases for May 2012

Speaking of updates to Google Chrome. On May 15, 2012, US-CERT announced the release of version 19 of Google Chrome for Linux, Mac, Windows and Chrome Frame to address multiple vulnerabilities. They reported that these vulnerabilities may allow an attacker to execute arbitrary code or cause a denial-of-service condition. They are encouraging users and administrators to update to Google Chrome 19.

Now, only a few days later, Google has come out with a full list of bugs that were fixed with the Chrome 19 release. There are 13 bug fixes. They are listed below.

1. [117409] High CVE-2011-3103: Crashes in v8 garbage collection. Credit to the Chromium development community (Brett Wilson).
2. [118018] Medium CVE-2011-3104: Out-of-bounds read in Skia. Credit to Google Chrome Security Team (Inferno).
3. [120912] High CVE-2011-3105: Use-after-free in first-letter handling. Credit to miaubiz.
4. [122654] Critical CVE-2011-3106: Browser memory corruption with websockets over SSL. Credit to the Chromium development community (Dharani Govindan).
5. [124625] High CVE-2011-3107: Crashes in the plug-in JavaScript bindings. Credit to the Chromium development community (Dharani Govindan).
6. [125159] Critical CVE-2011-3108: Use-after-free in browser cache. Credit to “efbiaiinzinz”.
7. [Linux only] [$1000] [126296] High CVE-2011-3109: Bad cast in GTK UI. Credit to Micha Bartholomé.
8. [126337] [126343] [126378] [127349] [127819] [127868] High CVE-2011-3110: Out of bounds writes in PDF. Credit to Mateusz Jurczyk of the Google Security Team, with contributions by Gynvael Coldwind of the Google Security Team.
9. [126414] Medium CVE-2011-3111: Invalid read in v8. Credit to Christian Holler.
10. [127331] High CVE-2011-3112: Use-after-free with invalid encrypted PDF. Credit to Mateusz Jurczyk of the Google Security Team, with contributions by Gynvael Coldwind of the Google Security Team.
11. [127883] High CVE-2011-3113: Invalid cast with colorspace handling in PDF. Credit to Mateusz Jurczyk of the Google Security Team, with contributions by Gynvael Coldwind of the Google Security Team.
12. [128014] High CVE-2011-3114: Buffer overflows with PDF functions. Credit to Google Chrome Security Team (scarybeasts).
13. [128018] High CVE-2011-3115: Type corruption in v8. Credit to Christian Holler.

You can see these updates from the Google Chrome Release page here.http://googlechromereleases.blogspot.com/search/label/Stable%20updates

If you are a Google Chrome fan you will also enjoy this article about the best Google Chrome extensions.

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Add Moustache To Face Images Using This Chrome Extension

Mustachio is a Google Chrome extension to have fun with the face images on web pages. It adds moustache to all images using face recognition technology.

To try it, install the Chrome extension from here and load any web page with a face image. Currently, it only processes images over 45000 pixels (that’s 300x150px or similar). For example, you can visit Shahrukh Khan’s Wikipedia page to see this extension in action.

Install Mustachio from Chrome Web Store. Have Fun!

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