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XG DHCP Server - Multiple Subnets (Not local interface subnets)

Colbey Elliott

Hi,

I've got a slightly complex network setup, but essentially 1 port on an XG is connected into a larger network which runs VRF's for various functions, ultimately we have a VRF on the remote end which has multiple VLANs that are connected with IP Helper's on each VLAN & subsequently routed back to us on the single port, however, we need to provide DHCP services for the 3x subnets.

Typically you would think, no problem, I'll setup a DHCP Server on the interface, with 3x scopes for the 3x different subnets.

However, when trying to do this, you get errors about not being able to because the subnets don't match the subnet that the interface is in.

Because we don't have the VLANs individually, and we can't use DHCP relay ourselves (as we don't have anything else to relay it too) how do we get around this in the land of Sophos XG?

Regards,

 

Colbey



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  • 0

    Just try adding DHCP scope, and not bind them to an interface. (In "network" - "DHCP" - Add under Server)

  • 0 in reply to sixteen again

    Hi,

    So it's let me do this, so long as I put the gateway address within the subnet of the DHCP server, ie.

    What I'd like to know now though, is where is this DHCP server listening, considering it's not assigned to a physical interface, and i cannot assign to a physical interface without it coming up with an error and ultimately not working.

    Essentially, i need to know where to point the IP Helper on the outside to, should it still be an interface, or do i need to create some kind of virtual interface (i tried Aliases, but i can't actually assign a DHCP server to an alias)

    Thanks,

    Colbey

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  • 0 in reply to sixteen again

    Hi,

    So it's let me do this, so long as I put the gateway address within the subnet of the DHCP server, ie.

    What I'd like to know now though, is where is this DHCP server listening, considering it's not assigned to a physical interface, and i cannot assign to a physical interface without it coming up with an error and ultimately not working.

    Essentially, i need to know where to point the IP Helper on the outside to, should it still be an interface, or do i need to create some kind of virtual interface (i tried Aliases, but i can't actually assign a DHCP server to an alias)

    Thanks,

    Colbey

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