Solved

Vlans---DHCP

Posted on 2004-08-30
6
675 Views
Last Modified: 2010-04-11
Hi. I created new a few new Vlans. I now want to have the clients get their IP address from a DHCP server that is on a diferent vlan. But they are not getting the address. I know the DHCP server is set up correctly so I must be missing some thing in the Vlan config

Any ideas??

Thanks
0
Comment
Question by:kdog3445
  • 3
  • 2
6 Comments
 
LVL 43

Expert Comment

by:JFrederick29
ID: 11934881
You need to add a helper address for you DHCP server to the VLAN interfaces:

interface vlan2
ip address 192.168.1.1 255.255.255.0
ip helper-address 192.168.0.10    <---use the IP address of the DHCP server.

interface vlan3
ip address 192.168.2.1 255.255.255.0
ip helper-address 192.168.0.10

interface vlan4
ip address 192.168.3.1 255.255.255.0
ip helper-address 192.168.0.10
0
 
LVL 15

Expert Comment

by:scampgb
ID: 11934907
Hi kdog3445,

VLANs completely seperate the networks, and will limit the broadcast domain for all the devices.
This means that your DHCP server doesn't see the broadcast IP request from the clients on the other VLAN.

To make this work, you'll need to do something to allow the DHCP server to "see" the clients on the other LAN.  Obvious options are:
1 - Install another network card in the server, and plug it into the other VLAN
2 - Use a router of some description to route the traffic between the VLANs

Does that make sense?

0
 

Author Comment

by:kdog3445
ID: 11934950
I tryed that. Does any thing look wrong here

interface Vlan140
 description 4thFloorWorkstation
 ip address 10.100.40.2 255.255.254.0
 ip helper-address 10.10.1.30
 no ip redirects
 standby 100 ip 10.100.40.1
 standby 100 priority 100
0
IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 43

Accepted Solution

by:
JFrederick29 earned 500 total points
ID: 11935003
You have a scope on your DHCP server for the 10.100.40.0/23 subnet, right?
0
 

Author Comment

by:kdog3445
ID: 11935067
it is /24 on the DHCP server which I am changing now, Be right back
0
 

Author Comment

by:kdog3445
ID: 11935224
Thanks JFrederick29  I had 2 diferent sub net masks
0

Featured Post

Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

Join & Write a Comment

Even if you have implemented a Mobile Device Management solution company wide, it is a good idea to make sure you are taking into account all of the major risks to your electronic protected health information (ePHI).
Don’t let your business fall victim to the coming apocalypse – use our Survival Guide for the Fax Apocalypse to identify the risks and signs of zombie fax activities at your business.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

759 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

20 Experts available now in Live!

Get 1:1 Help Now