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No Internet when 1 computer on network

a client has a network in their house. dlink router, bought 6 months ago. they have 2 computers connected wirelessly, 1 desktop called "gaming", one laptop called "ernie". the gaming computer has a printer connected to it and shared. in the office, i replaced an older computer with another used but newer, which will be called "office". the internet is in the country, where dsl/cable is not availble. the internet is wireless, with a fixed ip address, gateway, etc. these values are entered in the router, which connects to the WAN radio on top of the house. with the network setup successfully for months now, both gaming and ernie can go on the internet, share printers, etc.

this is where the fun stopped. when i switched the office computer to the new one (xp sp2), the internet connecton would not work. all 3 computers could continue to see each other, share files, share printers, but none of the 3 could connect to the internet. when i plugged the radio cable straight into the computer (instead of teh router), and put in the fixed values, it also could not go onto the internet. yet when that office computer was not on the network, the internet worked fine for the gaming and ernie computers.

i am stumped. what should i look at first? is it a software issue with the office system? hardware? should i plug another network card into the pci slot and try that one? (currently onboard). is it a lspfix issue? where to start?
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schroederman
Asked:
schroederman
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1 Solution
 
tvman_odCommented:
Disconnect that new computer and power cycle all the equipment.
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schroedermanAuthor Commented:
tried that already. restarted wireless radio, router, all computers at the same time.
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tvman_odCommented:
Not all, disconnect the new one and not connect it for a while.

Did you call ISP to check account status?
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2PiFLCommented:

Check the IP address of the new computer, if it is the same as the default gateway everything bound for the internet will go there instead.
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Beachdude67Commented:
It's definately the office computer causing this problem. Several causes come immediately to mind:

1) The office PC has a virus or some other malware that is dominating the internet connection at the expense of the rest of the network.

2) The office PC is configured as a DHCP server or is somehow otherwise configured to cause a conflict with the router. Since it is a used PC, this is certainly possible.

You might start there. Both could be fixed by starting over with the new PC, which I would recommend in any case.
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schroedermanAuthor Commented:
tvman_od: isp said account is good to go. they were able to ping our radio, but i could not ping from teh office computer through the router to their gateway or to their package shaper. both ip's were given to me to check from teh isp tech. when i got home, since i have the same internet setup, i was able to ping those numbers from my system. should have been the same results from the client's house.

2PiFL: the ip address is dictated by the dhcp on the router. it is in the appropriate range (router is set to give out between 192.168.0.100 and 110, it is 104. gateway is 192.168.0.1

Beachdude67: i will check further for spyware/virus's. the newest avg is loaded, but i have not checked with spybot, adaware, online tests, etc. will check tonight. also, as mentioned above, it is getting a correct ip address from the router, so i'm sure it's not dhcp serving.

the used computer worked fine on my home network, with a close match in routers and same isp/internet radio. the computer had shared my printers as well, and accessed the info when i reformatted it a week before selling it to them.
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schroedermanAuthor Commented:
i'm at the client's place again. the internet is working great (i'm on the laptop named ernie). i put a pci network card on the office desktop, when in windows, it found an ip address from the network (192.168.0.102), so it is reading the router fine. i could use the printer, but no computers could now go on the internet (including this laptop).

when i power cycled the router, with the office computer unplugged from the network, the laptop could again access the internet.

any ideas?
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2PiFLCommented:

What happens if you turn off the office computer, verify that the other workstations can get to the net, then power on the office PC?
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schroedermanAuthor Commented:
as soon as the office pc is into windows and has obtained an ip address, the internet is longer accessible by anyone.
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tvman_odCommented:
Check all the network protocols on the desktop with the problem. Uninstall/disable everything except TCP/IP. Check connection sharing setting on the interface
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2PiFLCommented:

Plug the "trouble" workstation into a different switch port (on the router) to see if it makes a difference.
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schroedermanAuthor Commented:
tvman_od: will try.

2PiFL: tried that off the hop. didn't make a difference.

does anyone know about lspfix? what is it? i have been googling around (like wading through a 4' deep pool of pancake syrop) and found some mentions of internet fixes using it. what does it do?
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tvman_odCommented:
Try this instead of using third party applications
http://support.microsoft.com/kb/299357

Besides that check ARP on all computers before you plug this desktop to the network and after, including router.
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schroedermanAuthor Commented:
after trying this several times, i went back today (a month after initially trying) and switchign ports worked flawlessly. not sure what differed from then till now, so this is not a 100% solution, but worked in my case.

thanks!
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