DNS and internet

We have 2 teams, 1 that manages DNS and 1 that manages the routers. Our internet goes out sometimes. What can I do to test and prove that its not DNS that is having issues?

Anybody have a diagram of what happens to a request once the website is put in a browser? Step by step?
Thomas NSystems Analyst - Windows System AdministratorAsked:
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Wayne88Commented:
If your internet goes out and you still can ping say www.yahoo.com or www.google.com then it's not a dns issue.

You can test this the next time your internet is out and you open a command prompt from Windows and type "ping www.yahoo.ca" for example.  If you get a reply then it's not a dns issue.

However, if you don't get a reply then it could be a routing issue, network link issue or that the dns server may be down.
Guillermo Rodrigo GilConsultorCommented:
Hi
You need this?
dnsresolution.png
Wayne88Commented:
Also, if you suspect that your DNS is the problem preventing you from pulling up a webpage you can also try switching to a public DNS server like Google DNS 8.8.8.8 or 8.8.4.4 to see if you access the internet then.
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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
So if say I cant get to www.yahoo.com and I cant ping it. Should I still be able to get it even if we cant get out to the internet because it uses the cache?  What is the point of cache. We always go to that site. How does the cache get cleared?
Wayne88Commented:
You can clear the cache via the browser and the "how" depends on what browser you're using.  You can Google "clear cache" for your specific browser to see the instructino.

If you can't ping it then there is an issue somewhere in between your workstation and www.yahoo.com

You mentioned " internet goes out sometimes", when this happens can you ping the DNS server or the default gateway?  If yes then we eliminated that the DNS server or the router may be down.

If the DNS server is not resolving the names it won't be a "sometime down" issue.  DNS server is normally reliable and if it's properly configured once and if it's up and running it's normally not a DNS issue.

To eliminate whether if it's a DNS issue or a network connection related issue then you can simply ping a website name by IP address (e.g. 98.139.180.149 for www.yahoo.com for example).  Did you get a reply here?  If not then it's not a DNS issue, it's a network issue.
Wayne88Commented:
Here are the steps I will take the next time you can't pull up an external web page:

1.  ping the www.yahoo.com (if no reply then proceed to next step, if yes then maybe the problem is with your internet browser?)

2. ping 98.139.180.149 (if there is a reply then DNS server is the problem, if no reply then go to the next step)

3. ping the internal default gateway (if no reply then network/router/link, etc. may be down.  If there is a reply then you will have to start eliminating each point outside your network to see where the disconnect is like external gateway (ISP), etc.

You can also do a traceroute to see where the disconnect stop.  Check this link:

How to use the Tracert command-line utility to troubleshoot TCP/IP problems in Windows

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Thomas NSystems Analyst - Windows System AdministratorAuthor Commented:
okay I will try it
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