Solved

DHCP Issues with Multiple VLANs

Posted on 2013-12-16
6
347 Views
Last Modified: 2016-11-23
Hello,
We have five VLANs. One for each of our four floors and one for wireless. Oftentimes we will move computers to different floors (different subnets/VLANs). Whenever we do that, the PC is not able to pick up an IP from that floors VLAN using DHCP. The only way I can get it to work is by giving it an IP manually. This is not ideal. Is there any way to fix this? The switches we uses are Dell PowerConnect 5548 in a Windows DC environment.

Thank You in Advance,
ES
0
Comment
Question by:eshiram
6 Comments
 
LVL 6

Expert Comment

by:Ramakrishna Prabhu
Comment Utility
Have you checked the dhcp table to see if IP's are available for your switch to assign?
0
 
LVL 10

Accepted Solution

by:
tmoore1962 earned 500 total points
Comment Utility
Does a release / renew command work on the systems?
cmd prompt
ipconfig /release *
ipconfig /renew *
If this works it is because the dhcp lease hasn't expired and you dhcp server probably trunked for each of the different scopes for each vlan.  You either have to shorten lease time shorter than anyone spends on a given floor - not practical or make shortcut to script to release / renew the IP when they move to another floor
0
 
LVL 45

Expert Comment

by:Craig Beck
Comment Utility
Are you running DHCP snooping on your switches?
0
Free Gift Card with Acronis Backup Purchase!

Backup any data in any location: local and remote systems, physical and virtual servers, private and public clouds, Macs and PCs, tablets and mobile devices, & more! For limited time only, buy any Acronis backup products and get a FREE Amazon/Best Buy gift card worth up to $200!

 

Author Comment

by:eshiram
Comment Utility
No that is not running on our switches.
0
 
LVL 45

Expert Comment

by:Craig Beck
Comment Utility
On the server can you try to clear the ARP cache before a moved PC connects to the network - just as a test?

CMD --> arp -d
0
 
LVL 16

Expert Comment

by:vivigatt
Comment Utility
Have you set a DHCP forwarder (ip-helper address) on the routing device(s)?
Is DHCP working on the "non-floor" vlans, for the nodes that are usually on these VLANs?
0

Featured Post

Do email signature updates give you a headache?

Constantly trying to correctly format email signatures? Spending all of your time at every user’s desk to make updates? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today!

Join & Write a Comment

This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
Restoring deleted objects in Active Directory has been a standard feature in Active Directory for many years, yet some admins may not know what is available.
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles to another domain controller. Log onto the new domain controller with a user account t…

772 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now