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Windows 7: Can't connect two computers to one router?

06 Dec 2012   #1

W7 64
Can't connect two computers to one router?


So everything was fine until today when I woke up. My internet wouldn't work, it was saying that I was connected with internet access but never gave me it. I checked my router settings and it shows all the correct things.

So then, I decided to check my brother's computer which is in the same room and he couldn't connect either. I turned my computer off and somehow, my brother's computer had internet access and could access the internet.

So, I need help.

Posting from my brother's PC now. I have attempted everything, restarted the power to everything about 5 times. Our internet has always worked and has until today.

My System SpecsSystem Spec
06 Dec 2012   #2

Win 7 ultimate x64 sp1

router should be set up with dhcp ON, so it can assign different IP addresses to the pcs. both pc's should be set to obtain their IP addresses automatically. if the pcs have been set with fixed IP addresses, they will conflict and only one will get on, typically the first one that boots up, which sounds like your problem. hopefully you have access to the pc adapter settings and the router settings. if you must use fixed ip addresses make sure they are different on each pc.

note: even if the router is set to supply dhcp, it also may have a setting to force a fixed IP to a specific MAC address, which is unique to each pc. again, if used, this must assign different ip addresses to each device. also check your lease tables.

check your pc settings by opening an admin. command prompt and typing

ipconfig /all

then hit return. compare settings to same on working pc. incorrect dns settings can cause an apparent good connection without it being able to actually browse.

if the non-connecting pc is not picking up an IP correctly, windows assigns an APIPA (automatic private ip address) in the range 169.x.y.z. the router won't let that get on the internet tho it's OK for your local area network. sometimes right clicking the notification tray icon & choosing 'troubleshoot...' might fix that.

checking the logs on the router, and on the pc (with event viewer) may guide you as well if the above doesn't.
My System SpecsSystem Spec
06 Dec 2012   #3

W7 64

Yes, I've got access to my router settings but what should I change?
My System SpecsSystem Spec

06 Dec 2012   #4

W7 64

I see, but what are my looking for when I do ipconfig /all?
My System SpecsSystem Spec
06 Dec 2012   #5

W7 64

Another thing: If I attempt to start my other computer up the one that can connect dissconnects and neither can get on.
My System SpecsSystem Spec
06 Dec 2012   #6
Microsoft MVP

Windows 7 Ultimate X64 SP1

Try powering off the modem, router, and both PCs. Turn back on in this order and wait for each one to fully boot before turning the next one on.

3.1st PC
4.2nd PC
My System SpecsSystem Spec

 Can't connect two computers to one router?

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