Thanks for your response. WPS isn't an option for me so there is only one way to configure. I actually did a hard reset and connected it to another network. Then I rest it again and reconnected it to my network. At that point, it started working properly. There are no IP reservations that would affect this. I tried disabling the DHCP server instead of Auto, but it made no difference. When it failed, neither the extender nor the laptop was visible on the router. It's working now, so I am going to leave it alone.

mrschwarz wrote

So...I have relatively plain vanilla home network. I have a temp sensor that is too far from the router to keep a reliable connection. I purchased a RE105 repeater a couple of years ago. I set it up as a repeater using the default settings. It worked without a problem up until a few days ago. On 3/18, I received an email from the monitoring service that the sensor was offline. 

 

As a first step, I power cycled the repeater, but it didn't restore the connector. I could connect my laptop to the repeater, but it didn't see the internet and the 'signal' LED wasn't lit. I then performed a hard reset. I set the repeater up using the same parameters as originally done. 

 

Since I did that, when I connect my laptop to my router, I get a duplicate IP error and cannot connect to the internet. I can connected to the '_EXT' network on the repeater without a problem, but when I connect to the router, I get no internet. In addition, the entire network is unstable. Just for fun, I updated to the latest firmware, but nothing changed.

 

Is this a hardware failure? Is there anything I can do to verify or fix this?

  

Try resetting both the router and the repeater to their default settings and then setting them up again from scratch. Make sure that you are setting up the repeater as a repeater and not as an access point, as this could cause issues with IP address conflicts. 
Regards: Pintdd

  @ClaytonBodhi 

 

I have had the same problem.  Regrettably, to solve it, I have had to use Power Line adapters.  I am not happy with these either as they have often been unstable in the past.  

 

You say that "Make sure that you are setting up the repeater as a repeater and not as an access point, as this could cause issues with IP address conflicts."  

 

What must be done to make sure this requirement is respected?  

  @mrschwarz 

Just bought one and experienced same error, even manually configured  a static ip address for my computer, it still popped up with same error "duplicate ip". Tried to reset the repeater a couple of times but the issue still happened after. I did test by  changing one setting by turning off DHCP on the repeater after I connect it as an extender to my house's wifi and looked like the issue has not happened again (so far 3 hours since I changed it). Will watch it to see if it actually fixes the problem. If some ones have tried the same and still experienced the same issue, please let me know. Thanks.

 

  @mrschwarz So...Just to update. This has happened so many times, that I have tossed the device in the trash. It's has caused all kinds of issues repetitively on my networks and requires constant babysittings and resets to keep it working. In my use case, I only needed it for a single device, so I took an old router, created a new wifi network and configured it as a repeater. Since the sensor is on it's own network and the router is only a repeater, I have had weeks of peace without any network interference. The sensor reports dutifully too.

 

My advice is to stay away from this device. It's not worth the trouble, at least in my case.