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Cant get passed router with wired connection but works fine with wireless!?

Posted on 2013-01-03
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Last Modified: 2013-01-26
Hello Experts!  
I need some help.  I have a problem that I can't find an answer to and I am out of answers.

I have a laptop in our company domain that is having issues with his LAN connection in our corporate office ONLY.  He is not able to get to the internet when connected in the office but the LAN connection works fine on every other outside network we have tried it on. I have taken the laptop home and tested it and it works fine.  Also we have tested it in hotels and there is not LAN issues.  BUT the odd thing is that the wireless connection works PERFECTLY all the time, even in the corporate office.  This computer NEVER had a issue until randomly it stopped working, it just doesnt make sense.  This is the only computer that is having an issue in our office.  Below is what I have tried to make it work.

- Pinging Google.com via IP address
- Different ethernet cable(s) and ports
- Uninstalled/reinstalled new drivers
- Turned off firewall
- ipconfig/release, renew, flushdns, registerdns
- Set a static ip/subnet mask/dns/gateway
- Virus scan (malwarebytes)
- Checked for IE proxy
- Reinstall Windows 7

There maybe a couple other things i tried but just cant remember at this time.  Any help would be great!
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Question by:FOSBELIT
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Expert Comment

by:pony10us
ID: 38740826
Check the router for any ACL blocking the IP address the laptop is using.
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Expert Comment

by:CiscoDawg
ID: 38740835
Start again with setting a static IP on the PC that is verified not being used.  Then do ping tests to the local Vlan gateway, then to some other internal IP outside the Vlan, then try the Proxy IP, then finally try an Internet IP like 4.2.2.1 (AT&T DNS) or 8.8.4.4 (Google DNS).  Where it fails at will give a good indication as to where the problem is.  If it fails immediately to the Vlan GW, then recheck the IP settings and possibly have the local network guys check for a stuck incomplete ARP entry that can be cleared.  Post all results.  Thanks
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Expert Comment

by:upalakshitha
ID: 38740847
Issue is your ethernet switch. Didn't you try to connect to different a switch in your LAN?
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Author Comment

by:FOSBELIT
ID: 38741130
Yes I tried different ports on the switch.
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Expert Comment

by:masnrock
ID: 38750393
Or you can temporary connect an external NIC for testing purposes. But I would check the ACL on your office switch first. Maybe even look within Windows and check the TCP/IP settings for that particular network. What type of policies exist on the corporate network?
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Expert Comment

by:CiscoDawg
ID: 38780396
If the LAN ports don't work then the switch(es) that serve those might need to checked.  They may not be setup with a default GW.  Check that.  Without some more detailed information I am afraid we are just guessing yet.
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Expert Comment

by:pony10us
ID: 38780408
As asked by upalakshitha, did you try a completely different switch if possible?  Not just a different port in the same switch.
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Accepted Solution

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FOSBELIT earned 0 total points
ID: 38802500
We found the answer!
It turns out that there were to separate problems.
1) There was a set static pubic DNS address in the TCP/IP properties. Reset the DNS address to automatic.
2) DHCP had a problem with the address it gave the computer. I removed the entry from DHCP and from the DNS server. A new address was given to the computer thus ending problem accessing the Internet.

Thanks for all the suggestions.
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Author Closing Comment

by:FOSBELIT
ID: 38821815
This is the procedure I used to fix the problem. It worked and none of the other suggestions uorked.,
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