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DHCP Server for multiple subnets

Posted on 2006-10-24
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Last Modified: 2010-04-18
I need to set up a DHCP server for multiple subnets. Each network has a router as there gateway. Is there a way to set up DHCP on 2003 so that it will traverse each router to asign the proper IP to each subnet?
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Question by:tamray_tech
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by:Pber
ID: 17798117
You have to setup a IP helper on each router and point that to the DHCP server IP.
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Pber earned 500 total points
ID: 17798149
See this as well.  it might help.
http://www.microsoft.com/technet/itsolutions/network/dhcp/default.mspx

Anyhow, further to my previous message.  Setup the IP helpers on the routers.  When the client sends a DHCP request from the subnet behind the router, the router will then forward those packets to the DHCP server.  On the DHCP server, you configure each subnet and options to match your subneting.  
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by:tamray_tech
ID: 17798171
I can do that, but is there anything special about the dhcp scope setup?
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by:CharliePete00
ID: 17798184
DHCP (aka BootP) requests are brodcasts and as such are not normally passed by routers.  

Some routers will can be configured to act as DHCP Relay Agents.  Consult the product documentation for your router for more information.  For Cisco routers see the following link for anexample of how this can be done:
 http://www.experts-exchange.com/Networking/Q_21069504.html.

You can also configure a Windows server to act as a relay agent.  See the following link for a brief tutorial:
http://www.computerperformance.co.uk/w2k3/services/DHCP_Relay_Agent.htm

Good Luck!
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by:Pber
ID: 17798199
No, nothing special.  

You can define global server options for all the subnet that have the same info.
i.e.  DNS servers, DNS Domain Name, WINS servers, WINS/NBT Node Type

The router (gateway) would have defined in each scope option.
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by:CharliePete00
ID: 17798206
Sorry about the redundat info.  One of these days I'll start remembering to refresh before submitting :)


As for scopes you should configure a seperate scope for each subnet
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