2 DHCP networks on same switch

Posted on 2003-03-24
Medium Priority
Last Modified: 2012-08-14
Ok, I am trying to figure out a way to run DHCP in parallel to another AD running DHCP on the same switch.  Long story, but there are two domains on the same switch.  they are completely separate entities and have no trust relationship, nor will they.  They have to stay on the same switches.

Is there any way I can run DHCP in parallel with the other AD without them messing each other up (which would normally happen of course).
Question by:northcide
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 10

Expert Comment

ID: 8194706
can you not create a super net. i.e. two different sub-nets on the same segment. could you not give each set of machines different ip adresses at the network part..

so if your subnet mask is

have one set of machines use 102.168.2.
and the other set 192.168.3

i think this may work

Author Comment

ID: 8195860
I'm a bit confused.  You are basically telling me to use different subnet masks to allow two different dhcp networks to co-exist on the switch correct?  well how is this possible if the DHCP server is the object leasing this information to the clients?

Expert Comment

ID: 8196399
Maybe it is possible to configure 2 VLAN on your switch to separate the DHCP servers ?
Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

LVL 10

Accepted Solution

makerp earned 375 total points
ID: 8196812
ah, of course. thats not such a good suggestion then is it...

in that case either the VLAN option or stop using two DHCP servers and try and re-configure you setup so it works okay with just the one DHCP server and the two domains...

Expert Comment

ID: 8197150
vlans should prevent the DHCP broadcast that you're worried about.

Expert Comment

ID: 8197255
If the hardware and/or IOS support VLANs, 2 seperate VLANs create seperate broadcast domains.  Thus you can definitely have two DHCP servers on one switch as long as the ports are in seperate VLANs.

Expert Comment

ID: 8201226

Do you use the DHCP Relay / IPHelper functionality of the switch? If you do that, you will get trouble.

Disable this functionality and put the DHCP servers to that switch or use one of the servers or workstations connected to the switch as DHCP relay.


Author Comment

ID: 8202530
Nope, dont use much functionality of the switch atm.  I th the solution is going to be vlan.  thx all.

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

NTFS file system has been developed by Microsoft that is widely used by Windows NT operating system and its advanced versions. It is the mostly used over FAT file system as it provides superior features like reliability, security, storage, efficienc…
Check out the latest tech news, community articles, and expert highlights in August's newsletter.
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
Suggested Courses

770 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