Windows 10: win10 anniversary update shows connection but no internet access

I'm not OP.
@slicendice, if you could help me, actually train me, please Where do you see the the report that two devices have same IP? That is significant and I would like to learn. Thank you.

 

The list should be located under Home Network-->Devices.

There you should see the full list of all assigned IP addresses.

A couple of times 2 devices has gotten same IP with indefinite lease time (you can see the lease time if you click on one of the devices), which caused some networking not to work properly. Sometimes packets were routed correctly, sometimes they got lost in the modem/router. A full reset of the Router has solved this issue many times for me. There must be a bug in these devices or something...Because my router was given to me by my ISP, I don't have root access to it, and can therefore not get all features, which would help clean up leases and routing tables, enabled.

I have actually been planning on building my own router based on OpenWRT with my own added spices. These devices are quite simple really so it should not be that difficult to build a proper device that I could expand on demand. :-D

EDIT: This info only applies to the Technicolor devices. I am not sure how other devices behave. The one I have now (Inteno DG200ALA) does not have this issue, but that one has a bit of issues with the fancy GUI.

 

Turns out it must be the router afterall. I took the laptop to a friend's house and it had no problem connecting to the internet. I have reset the router many times since the problem occured (and i mean factory reset) and the issue persisted. I have a spare router lying around, i will set it up and come back for an update.

 

Are you certain your hard reset was done properly? You have to power off your device, disconnect power and press the reset button for 10-30s at least, depending on model (read the manual to be certain you do it the right way). If you do this wrong the router won't reset 100% and you may even end up bricking it.

Before you power on the router, make sure NO devices try to connect to it. Then assign a static IP to your main computer that connects through LAN.

Should be something like:

IPv4: 192.168.1.10
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DNS: 192.168.1.1

I assume your router has the default static gateway address of 192.168.1.1.

Then only connect this configured device to the router, nothing else. Go to the router web interface and check that your routing table is empty, and that there are no leases assigned, except for the IP 192.168.1.10 (your connected device). After this go and make sure the DHCP server on the router only assigns dynamic IPs only for the upper half of the range. EG. 192.168.1.128-192.168.1.254 (starting from 192.168.1.100 is ok too)

 

yeah the reset was done properly while talking to my isp's customer support. But i changed my router to a new one and it has been working perfectly since i installed it 3 days ago so i call it a success. Thank you guys for your time!