Jump to content

Welcome to Netduma Forum
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
Photo

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

DHCP 100% CPU slow

  • Please log in to reply
7 replies to this topic

#1
Rhino90

Rhino90

    Junior Member

  • Members
  • PipPip
  • 4 posts
  • Local time: 11:09 AM

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.

 

Attached File  Screenshot_2018-08-01_22-34-09.png   612.08KB   1 downloads

Attached File  Screenshot_2018-08-01_22-34-54.png   104.66KB   0 downloads



#2
Netduma Fraser

Netduma Fraser

    Tech & Customer Support

  • Administrators
  • 19,136 posts
  • Local time: 01:09 AM

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?


Twitter/Facebook/YouTube/Twitch/Instagram/Steam Group/Discord

 

Official R1 Support Times: 10am - 6pm BST



Official DumaOS/XR500 Support Times: 12pm - Midnight BST



Time Converter

If you're having Settings or Hardware issues with the XR500 please go here and login to get the number for Netgear's 24/7 support line: http://support.netgear.com/


#3
Rhino90

Rhino90

    Junior Member

  • Members
  • PipPip
  • 4 posts
  • Local time: 11:09 AM

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.



#4
Netduma Fraser

Netduma Fraser

    Tech & Customer Support

  • Administrators
  • 19,136 posts
  • Local time: 01:09 AM

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


Twitter/Facebook/YouTube/Twitch/Instagram/Steam Group/Discord

 

Official R1 Support Times: 10am - 6pm BST



Official DumaOS/XR500 Support Times: 12pm - Midnight BST



Time Converter

If you're having Settings or Hardware issues with the XR500 please go here and login to get the number for Netgear's 24/7 support line: http://support.netgear.com/


#5
Bmann

Bmann

    Member

  • Members
  • PipPip
  • 29 posts
  • Local time: 08:09 PM

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.



#6
Netduma Fraser

Netduma Fraser

    Tech & Customer Support

  • Administrators
  • 19,136 posts
  • Local time: 01:09 AM

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.

 

Are you on a firmware I sent you for drops and has it worked?


Twitter/Facebook/YouTube/Twitch/Instagram/Steam Group/Discord

 

Official R1 Support Times: 10am - 6pm BST



Official DumaOS/XR500 Support Times: 12pm - Midnight BST



Time Converter

If you're having Settings or Hardware issues with the XR500 please go here and login to get the number for Netgear's 24/7 support line: http://support.netgear.com/


#7
Bmann

Bmann

    Member

  • Members
  • PipPip
  • 29 posts
  • Local time: 08:09 PM

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. :)



#8
Netduma Fraser

Netduma Fraser

    Tech & Customer Support

  • Administrators
  • 19,136 posts
  • Local time: 01:09 AM

Sent you a PM :)


Twitter/Facebook/YouTube/Twitch/Instagram/Steam Group/Discord

 

Official R1 Support Times: 10am - 6pm BST



Official DumaOS/XR500 Support Times: 12pm - Midnight BST



Time Converter

If you're having Settings or Hardware issues with the XR500 please go here and login to get the number for Netgear's 24/7 support line: http://support.netgear.com/






Also tagged with one or more of these keywords: DHCP, 100%, CPU, slow

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users