Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium


WiFi Addresses

Posted on 2013-12-20
Medium Priority
Last Modified: 2013-12-20
I am wondering if someone could educate me on wifi a bit.  I am noticing that our school wifi stops issuing ip addresses.  when I check the ap says there are 200-300 devices attached but I am sure there are not that many devices in the building.  It seems that people come and go but the ap is not releasing the address or removing the device from the list.  If i reset the ap the number of devices drops to something more reasonable and it starts issuing addresses again.

I have a router that is doing dhcp and the wifi is just an ap.
Question by:stcatechies
LVL 23

Accepted Solution

Thomas Grassi earned 2000 total points
ID: 39732336
The lease time for DHCP is too long reduce it and then it will release the ip address sooner.

What type of device is doing the DHCP?

See if it has a command  like this

clear ip dhcp binding {address | * }   that's for a cisco router

Author Comment

ID: 39732352
It is a cisco router and the lease time is 1440 minutes... 24hrs.   With so many students coming and going should i do something like 30 minutes?
LVL 10

Expert Comment

by:Gajendra Rathod
ID: 39732363
Restart or (disable and enable ) of DHCP server will lease all assigned IP address.

As mention in above comment decrease lease time of assigned IP addresses.
LVL 23

Expert Comment

by:Thomas Grassi
ID: 39732366
yes with that many changes best to change it to a lowest as possible .

check out the cisco command above in more detail for your router.

Here is the link I found

LVL 44

Expert Comment

ID: 39732376
What is the usual time you estimate the clients stay connected?

It's typical for clients to try renewing the lease when half the lease time has expired.

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Need WiFi? Often, there are perfectly good networks that don't have WiFi capability - and there's a need to add it.  - Perhaps you have an Ethernet port into a network but no WiFi nearby. - Perhaps you have a powerline extender and no WiFi at the…
Today sees the launch of a new case study, focusing on BYOD technologies we have been working with for some time now.  But with the advent of 802.11ac wireless technologies and the story behind our landmark developments, we would like to share this …
This Micro Tutorial will show you how to maximize your wireless card to its maximum capability. This will be demonstrated using Intel(R) Centrino(R) Wireless-N 2230 wireless card on Windows 8 operating system.
Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
Suggested Courses
Course of the Month13 days, 17 hours left to enroll

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question