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how to issue 3 dhcp scopes to 3 vlans with one dhcp server?

Posted on 2012-03-18
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Last Modified: 2012-04-12
Scenario:
--> there are 3 vlans i.e. vlan1, vlan11, vlan22
--> one DHCP server windows 2008 R2
--> Inter vlan is enabled through layer three switch.

Question:
how to issue 3 dhcp scopes with one dhcp server?
do i need multiple LAN cards with server and to connected with all vlans?
please help to configure dhcp rang to multiple vlans with one server?

please find the attachment for detail.
thanks
dhcp-with-vlans.jpg
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Question by:nainasipra
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3 Comments
 
LVL 24

Accepted Solution

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Dirk Kotte earned 2000 total points
ID: 37735238
you simply create the 3 scopes (adress ranges) at your dhcp server.
the switch (with routing mode?) connects all vlans and lets ping the server devices within all3 vlans... thats important.
this "router" need an ip-helper address (the ip from the dhcp-server).
this function catches the dhcp broadcast within the vlan (which is not routed by default) and redirect them as unicast to the dhcp-server.
the dhcp server "recognize" the ip-interface at which the switch ("router") firt seen the packet, takes a adress from the corresponsing scope and offer it.

your server should only have one IP-interface (NIC) - especially it is an domain-controller.
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Author Comment

by:nainasipra
ID: 37771317
Dear dkotte,

Please explain more how i will connect my switch to all vlans, and my switches have DHCP relay functionality how i can use that.
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LVL 24

Assisted Solution

by:Dirk Kotte
Dirk Kotte earned 2000 total points
ID: 37771397
first configure dhcp-relay or IP-helper as explained within your switch-.config-guide to point to your real DHCP-Server.
than configure the additional leases at your DHCP-Server. (new scope)
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