DHCP Multi VLAN Setup Issues



  • Hi all. I'm not a network guy by any means, but I'm trying to get my home network setup properly. What I'd like to do is setup DHCP on PfSense for a certain VLAN on my network, my client VLAN, or in this case VLAN 2.

    I've attached a network map to simplify.

    Basically, I'd like to have separate VLANs and interVLAN routing done on the L3 switch and have DHCP running for VLAN 2 from PfSense.

    So far I have All VLANs being able to ping 10.1.1.254, but I can't seem to wrap my head around what's left so that PfSense can do DHCP for the Airport Extreme on VLAN 2.

    What do I need to understand, or do, to accomplish this? Setting DHCP on the Airport Extreme is not possible since it will only do 10.0.1.1-50 range, not 10.1.10.1/24 range that I'd like it to do.
    ![Screen Shot 2014-01-05 at 3.37.45 PM.png](/public/imported_attachments/1/Screen Shot 2014-01-05 at 3.37.45 PM.png)
    ![Screen Shot 2014-01-05 at 3.37.45 PM.png_thumb](/public/imported_attachments/1/Screen Shot 2014-01-05 at 3.37.45 PM.png_thumb)


  • LAYER 8 Global Moderator

    Pfsense can currently provide dhcp for a network it does not have a interface in.  There are multiple threads about this - work around is to create an interface put it in the network you would like and then down the interface.. Search the forum



  • @johnpoz:

    Pfsense can currently provide dhcp for a network it does not have a interface in.  There are multiple threads about this - work around is to create an interface put it in the network you would like and then down the interface.. Search the forum

    I think I understand what you're saying, but in essence:

    Create an interface on the LAN port of PfSense, 10.1.10.1/24 and then enable DHCP? How will the VLAN traffic know to get its DHCP/DNS configuration from that specific interface on the 10.1.10.1/24 LAN port?

    When I tried this earlier, it overlapped and said it wasn't possible since it overlapped with 10.1.1.254/24 LAN port, but I'm sure it would work if I change the LAN subnet to a /16?


  • LAYER 8 Global Moderator

    You need to create a NEW interface, vlan for example. And no there would be no network overlap.

    As to how dhcp clients would know - you would have to setup a ip helper cisco calls it.  Dhcp relay on your switch.


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