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Connect either Desktop OR Laptop to Router but not both simultaneously

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Geek Wannabe 8

Geek Wannabe 8

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Hi Team,

Have read many posts regarding ability to connect to a router but not able to access the internet...many posters have described the same problem I currently have but no one has solved the riddle. Will try another post and see if someone in 2010 has an answer...

Attempting to set up a Tenda router (W311R) so that a Desktop and a Laptop can access internet simultaneously. We've tried everything (including speaking at length with Tech Support for Tenda routers, Dell laptop, ComCast - ISP provider) and end up with one of two situations:

1. Desktop hard wired or wireless connection to Router and able to access internet. Laptop hard wired or wireless connection to Router but NOT able to access internet.

2. Laptop hard wired or wireless connection to Router and able to access the internet (only happens when WLAN Security Setting on router is disabled). Desktop gets Limited or No Connectivity to internet and can't access internet.

Possible Clues (and history):

The desktop has a faulty disc drive and so could not use the setup disc provided with Tenda Router. Instead, put the disc in the laptop and setup from there. Later, copied the disc files onto a usb flash drive and transferred the files to the desktop via the usb.

In the setup Wizard for Tenda (accessed from the copied files as above), the desktop was never able to connect successfully to the router; however, in reality the desktop was always able to establish connection to router and internet (just the wizard didn't recognize it).

The laptop can always access the Router's webpage (by entering in IE address bar). The desktop has never been able to access the Router's webpage - the desktop has Mozilla Firefox v 3.6.3 (does not have IE installed).

In the setup Wizard, the final page says that if the router is configured successfully then the IP addresses will show up on that page...they never did. The IP address field, Mask and Default Gateway were always blank.

Things we tried:
Disabling Firewalls (Windows, McAfee, AVG, etc) had no effect.
Various power downs and resetting modem including Powering down laptop, router, modem waiting 10 min then restoring in that order had no effect.
Deleting network connections and recreating had no effect.
Changing Tenda router settings to dynamic ip, static ip, PPPoE had no effect nor did altering WLAN Security settings (tried WEP, WPA, WPA2, Mixed WEP, Disabled, various Security Keys and types)

No matter what we've tried, we can either connect the Desktop to the Router/Internet OR we connect the Laptop to Router/Internet but never both at the same time (repeated note: only time the laptop could connect to the internet was when WLAN Security Setting on router was disabled).

System info:
Desktop: Premio PC, MS Windows XP, v2002. Uses AVG security.
Laptop: Dell Inspiron 1525 (18 mo old), Vista, McAfee security.[/size]

Given the number of similar posts on this site and others, I'm guessing that anyone that answers this question will become QUITE the Hero/Heroine.

Hopefully expectant...
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Geek Wannabe 8

Geek Wannabe 8

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Part 2: Took the Tenda modem back and got a LinkSys WRT120N...and have the exact same problem. Multiple posts and threads across websites re this issue but no one seems to have an answer.

Modem: Scientific Atlanta DPC2100R2 \ Comcast Cable
Router: LinkSys WRT120N
Desktop: Premio, Windows 2002
Laptop: Dell Inspiron 1525, Vista

I need a Hero...and so do about 300 other people. Where is the Batman of the IT world?
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Do you meant setup configuration that your ADSL modem is connected your Tenda Wireless router? and your PC is plug into the Tenda Network port and your Laptop is using the wireless connection thru the Wireless Router?
Have you check that the ADSL modem is compatible to the Router?
Are your devices drivers up to date? both PC and Laptop
You can always use the microsoft "Chkdsk /f" to check your HDD if you suspect the HDD is a problem.

From what you have written probaly the hardware modem and router are not compatible.
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