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Win2008R2 DHCP on Multi-vlan network

Posted on 2011-02-24
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Last Modified: 2012-05-11
Hi,

I have several vlan on my network and i'm using DHCP on windows server 2008 for all my clients to obtain an ip. However, i did input the ip helper address 10.10.1.7 (DHCP server) on my vlan interface but still my clients do not get ips except for those whose is in the same vlan as the DHCP server.

Thanks...
MAINSWT01.txt
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Question by:brianvanschellebeck
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Expert Comment

by:Matt V
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Do you have a DHCP scope setup for the second IP range?  You will need a scope for each range of IPs (VLAN).
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Author Comment

by:brianvanschellebeck
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Hi,

Yes, i did create some scope for test. See screenshot attached.
DHCP-Scope.png
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AnthonyHamon earned 125 total points
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I would remove the 'ip dhcp pool' statements from your configuration - this configures the switch to as a DHCP server, which you do not want if your Windows Server 2008 based server will provide that service.  Also, your 'ip helper address' statements are currently under the 'ip dhcp pool' statements - these need to be under each 'interface vlan' statement instead.

When you have done this, if it does not work, reviewing the DHCP event log on the server is often helpful (run Event Viewer and go to Custom Views -> Server Roles -> DHCP)
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Assisted Solution

by:MAG03
MAG03 earned 125 total points
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i agree that if you are using a Windows server as DHCP server then you should remove the DHCP pools from the switch.

Second the reason the IP helper address is not working is because you do not configure it on the DHCP pool interface but on the VLAN interface.

for example:

interface Vlan30
 description <<<finance dept>>>
 ip address 10.30.1.2 255.255.255.0
 ip helper address 10.10.1.7

Remember that the vlan interface must have an ip address within the range that is to be leased out and, of course, the DHCP server must be configured to lease addresses.

When clients in the vlan send DHCP requests the ip address assigned to the vlan is used to choose the correct DHCP pool to assign addresses from.
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Author Comment

by:brianvanschellebeck
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Hi,
Thanks for the help.
I did remove the DHCP pool and add the ip the helper address on the interface vlan but still it doesnot work.

i had to include ip dhcp relay information trust-all on the router and it works.

Thanks....
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Author Closing Comment

by:brianvanschellebeck
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The solution was good and easy to follow but not fully complete.
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