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Multihomed DHCP

    Question

  • Is it possible to have a mulit-homed Server issues DHCP address only on one NIC. I have a server with two NICs that I need DHCP out of only one NIC to a seperate subnet.

    NIC1 - 192.168.100.x

    NIC2 - 172.31.1.x

    If I create a scope for 172.31.1.x, and assigned NIC2 172.31.1.1 IP, will it only give clients on that subnet (VLAN 2) the proper IP addresses. I don't wont any clients on the 192.168.100.x subnet (VLAN 1) to get IPs from this particular server. There is no routing between VLANs.

    Monday, August 20, 2012 2:44 PM

Answers

  • If I understand this correctly then as long as you do not have a scope setup for the 192. network then this will work fine.

    DHCP will only give out an address to the nic in the same subnet as the scope.

    You can set the interface that DHCP listens too also

    Right-click on the Server name
    Choose Properties
    Choose advance Tab
    Choose the Bindings Button
    Select active interfaces

    Monday, August 20, 2012 3:55 PM

All replies

  • If I understand this correctly then as long as you do not have a scope setup for the 192. network then this will work fine.

    DHCP will only give out an address to the nic in the same subnet as the scope.

    You can set the interface that DHCP listens too also

    Right-click on the Server name
    Choose Properties
    Choose advance Tab
    Choose the Bindings Button
    Select active interfaces

    Monday, August 20, 2012 3:55 PM
  • I agree with Gary. It won;t give IPs on the 192. interface. DHCP is pretty smart with that. That's the same reason why you need a relay agent to a subnet for a scope that the DHCP server is not directly connected to.

    Ace Fekay
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    Monday, August 20, 2012 4:18 PM
  • Hi Ronald,

    Thanks for posting here.

    We can achieve that by deselecting the NIC1 in properties on that server and that will make server never sent any DHCP traffic through this interface  :

    Set DHCP Server Bindings for Network Connections

    http://technet.microsoft.com/en-us/library/dd296628(WS.10).aspx

    For more information please refer to the link below:

    DHCP network interface card bindings

    http://technet.microsoft.com/en-us/library/cc770650.aspx

    Thanks.

    Tiger Li


    Tiger Li

    TechNet Community Support

    Tuesday, August 21, 2012 7:19 AM