Jump to content
Sign in to follow this  
Rhino90

100% CPU and high DHCP lease change events. Router slows down.

Recommended Posts

I tried to log into the router and noticed it was slow to open the page.  I noticed that one CPU usage was pegged at 100%. Not both CPU's, they would alternate to 100% but both still very high. Normally the CPU's utilisation is low. I then checked the logs and it showed a lot of DHCP events happening quite fast. This is not normal. I checked the device MAC addresses and they happen with computers, iPhones, iPads etc, so I don't think it's the clients. Please see attached pictures. When the router gets into this state, I have to reboot it.

 

post-31150-0-17121900-1533127612_thumb.png

post-31150-0-67324300-1533127639_thumb.png

Share this post


Link to post
Share on other sites

I think what is happening is that DHCP Lease is by default set to 24hours. Looks like yours renews at around 10:30pm. You shouldn't need to reboot. When it happens again open a cmd prompt on your PC and type the following:

 

ipconfig /release and press enter

 

ipconfig /renew and press enter

 

once it's done then try and access the interface, does it appear to load fine then?

Share this post


Link to post
Share on other sites

Thanks Fraser. I'll take a note of it and keep a lookout the next time it does a DHCP refresh to all devices. It was just strange that the router became very slow with high CPU utilisation as normally and after a reboot, it's very low at around 25-30%. Very happy with the router otherwise and looking forward to new features.

Share this post


Link to post
Share on other sites

Thanks Fraser. I'll take a note of it and keep a lookout the next time it does a DHCP refresh to all devices. It was just strange that the router became very slow with high CPU utilisation as normally and after a reboot, it's very low at around 25-30%. Very happy with the router otherwise and looking forward to new features.

 

I imagine its just because of the DHCP Lease running out, if its not then we can look into it further

Share this post


Link to post
Share on other sites

This is what I reported after a few hours of owning my router.  My logs always indicated DHCP lease renewals and then my connections would drop.

Share this post


Link to post
Share on other sites

I never installed the firmware for drops on purpose since I was trying to determine root cause.  I was able to get mine stable without using it and am waiting for the new firmware with all those fixes bundled together. I have observed the DHCP and CPU spikes but was just holding out for new firmware. :)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×