DNS Issue - Laptop can't connect to Internet

I have a small network with two laptops connected to the Internet.  The building has a T1 for access and the two laptops are connected through a Linksys router.  One of the laptops can connect to the Internet from both the classroom and the office ethernet drops.   The other laptop can connect only from the office drop.  It can not connect from the classroom drop.  I've been to the site and my laptop can connect from both the classroom and the office drop.  I also had a local wiring contractor out to test the drops and cables.  Everythings fine there.  I did a DNS flush on the laptop that can connect only from the office drop.  That didn't work.  Any suggestions?  I'm getting ready to rebuild the laptop just to get this thing working again.
AEOAHSAsked:
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DCenaculoCommented:
When you connect the laptop with problems to the classroom, does it get the correct ip addresses ? Connect it to some network point that you tested with the good laptop and make an ipconfig /renew. Which IP address and default gateway does it get ? Compare that information with the goog laptop and say something please.

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kalavCommented:
Compare both laptops' ip configuration..mainly ip address, subnet, getway and dns server/host files.
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omarfaridCommented:
Check the DNS setup on the laptop. It could be having a DNS server configured that is not reachable from classroom.

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AEOAHSAuthor Commented:
The laptop is receiving the correct IP address range, subnet and gateway from the router.  I've done a /release and/renew to verify that the router is issuing the correct numbers.
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AEOAHSAuthor Commented:
DNS settings of TCP/IP properties are set correctly.  DNS server is "obtain automatically" from the router.  The DNS tab is also set correctly with no specific entries.
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omarfaridCommented:
If you run

ipconfig /all

What is the dns server ip address?
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DCenaculoCommented:
Can it ping default gateway ? try to make a ping to some site with the good laptop. Then go to the bad one and instead of use the DNS name use the ip address in the IE address bar justo to see if  goes there by IP address.
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AEOAHSAuthor Commented:
The DNS server IP address is the same as the routers gateway number.   I should also comment that any laptop on the network can ping the computer that can't reach the Internet.
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DCenaculoCommented:
And the internet options/connections/LAN definitios of IE ? Are the same in all of them ?
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AEOAHSAuthor Commented:
The "bad" laptop can ping the gateway.  I'm going to have to try the second suggestion to type the IP address on the IE address toolbar this afternoon.  The teacher and kids have left for a field trip.  No one is there to work on this until this afternoon.  I'll keep everyone posted.
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AEOAHSAuthor Commented:
I'll have the teacher check the IE LAN connections this afternoon.  Sorry for the delay, but I don't have anyone at the site at this time.  I'll post later this afternoon or first thing in the morning.
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AEOAHSAuthor Commented:
I would assume that the IE LAN connections settings of the "bad" laptop have to be set properly since it can reach the Internet in the office.  Just not the classroom.

That's the whole mystery to this issue.  The "bad" laptop can perform all Internet and email functions from the office, but not the classroom.  How can the ethernet drop affect DNS settings, etc. from room to room?

I'll keep checking anyone's suggestions because this one is a mystery to many network techies I'm talking to.
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omarfaridCommented:
Do you have a firewall some where that could be stopping you?
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DCenaculoCommented:
It's a mistery for me also at this momemt. But if that laptop was configured to automatically detect proxy defenitions, for example, instead of already having IP addresses configured, some switch could be causing some problems to that detection.
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AEOAHSAuthor Commented:
I'll check the laptop firewall settings.  By default I have the laptops to have Windows XP firewall software turned off.  I didn't check that setting so I guess it's possible that software somehow got turned on.  I'll reply after checking all these suggstions this afternoon.
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AEOAHSAuthor Commented:
This laptop is a "clone" of 60 other identical laptops and has been working all year since September when the staff returned.  For some reason, this issue poped up after the weekend.  I asked the staff if anyone had the laptop at home trying to connect to the Internet outside of our network.  The answer I got was no.  If push comes to shove, I'm assuming the only way to correct this would be a rebuild.

I will get back to everyone helping with answers to your suggestions.
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AEOAHSAuthor Commented:
I've had to go to this site and reverify all the troubleshooting that we've done over the phone.  Everything is set and testing ok.  The laptop did actually start working for 1 1/2 days last week and then quit working again.  I'm not going to spend any futher time on this issue.  I'm going to try and rebuild the laptop and go from there.  I appreciate anyone who helped me with this situation.

I need to contact Expert Exchange support because I don't know how to aware points or accept answers on this issue.  It's technically still unsolved, but everyone has been a tremendous help with advise and suggestions.
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AEOAHSAuthor Commented:
All solutions were excellent suggestions and were technically accurate.  However, none of the solutions fixed the issue.  It is an issue that even local networking specialists are baffled on.  Everyone did an excellent job at trying to help me out.  Thank you!
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