Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


Forums › LAN (ethernet/Wifi/routers/Bluetooth) › 2 Degrees ISP/DHCP issue - constantly renewing every 2.5 mins
Ristretto63

2 posts

Wannabe Geek


#319429 24-Apr-2025 13:31
Send private message

Hi Team

 

Our business router is constantly renewing IP address every 2.5 mins.

 

ER706W-4G - Omada 4G+ Cat6 AX3000 Gigabit VPN Router

 

1 2025-04-24 13:26:44 DHCP Client NOTICE

 

WAN2: DHCP client renewing IP succeeded. (IP-Address=203.86.192.199, Mask=255.255.255.240, Gateway=203.86.192.193)

 

2 2025-04-24 13:26:41 DHCP Client NOTICE

 

WAN2: DHCP client lease expired. Began renewing the lease.

 

3 2025-04-24 13:24:14 DHCP Client NOTICE

 

WAN2: DHCP client renewing IP succeeded. (IP-Address=203.86.192.199, Mask=255.255.255.240, Gateway=203.86.192.193) 4 2025-04-24 13:24:11 DHCP Client NOTICE WAN2: DHCP client lease expired. Began renewing the lease.

 

I sent email to 2 Degrees as I believed that it was an issue with their DHCP server

 

Their response was: 

 

Thank you for your email, I'm sorry to hear there's been ongoing issues, 

 

Our assurance team has investigated and advised the issue does not appear to be on our side. 

 

They have recommended you refer to the vendor regarding your BYOD,

 

They have recommended checking your DHCP settings, checking for any potential Rogue DHCP server on the network,

 

Checking physically damaged ports/cables. Ensuring the Network adaptor drivers are up to date,

 

checking for Multi-DNS issue if applicable, checking for Lease time settings and Firewall issues.
These potential reasons why the issue may be occurring and they are beyond our scope. 
Please let me know if you have any further question by replying to this email,

 

 

 

Does anyone else have similar issues and how have you resolved them.

 

 

 

Cheers

 

JH

 

 

Create new topic

This is a filtered page: currently showing replies marked as answers. Click here to see full discussion.

saf

saf
221 posts

Master Geek
+1 received by user: 533

ID Verified
Trusted
Vetta Group
Subscriber

  #3367143 24-Apr-2025 14:47
Send private message

For a 5 minute DHCP lease, a renew at the ~2.5 minute mark is absolutely normal, and a lease renew at half of the expiry time is expected, as per RFC 2131.

 

On renews, routers should then wait for a binding as below (from the RFC):

 

   In both RENEWING and REBINDING states, if the client receives no
 
   response to its DHCPREQUEST message, the client SHOULD wait one-half
 
   of the remaining time until T2 (in RENEWING state) and one-half of
 
   the remaining lease time (in REBINDING state), down to a minimum of
 
   60 seconds, before retransmitting the DHCPREQUEST message.

 

A normal DHCP renew should not cause any impact, and if it's not - then there's nothing wrong with your service, it's doing exactly as it should as per RFC. This is good, what you don't want is your lease getting to the expiry time which would cause an interruption, as it would need to request a whole new lease, rather than a renew.

 

If however you're getting an outage every ~2.5 minutes at renew time, that's a different story. If so, my first port of call would be ensuring your device firmware/software is all up to date in case a buggy version was released which doesn't obey the above mentioned RFC statement about wait times from a renew or rebind request.

 

 




My views are as unique as a unicorn riding a unicycle. They do not reflect the opinions of my employer, my cat, or the sentient coffee machine in the break room.

Create new topic








Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Updates »

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.








RSS feeds
Main feed
Forums feed
Copyright
©2002-2026 Geekzone®
Site features
Geekzone BI dashboard
Geekzone Badges
Geekzone Status Page

 

Site Information
Subscribe to Geekzone
Privacy Statement
Forum Usage Guidelines (FUG)
Advertising
Trademark and copyright