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If the thing that concerns you is that DHCP consumes gateway IP, you should
define your gateway when creating the subnet with --gateway option [1].

Also I *think* that if you define --allocation-pool while creating subnet,
DHCP server will obtain IP within this pool, but I'm not 100% sure now, as
I had such setup years ago.

If you are disabling DHCP, then ensure your VMs will use config-drives for
metadata instead of fetching it through the network. For that you will need
to supply an option while creating the VM

[1]
https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/subnet.html#cmdoption-openstack-subnet-create-gateway

On Fri, Jul 21, 2023, 03:24 Ihar Hrachyshka <ihrachys at redhat.com> wrote:

> On Thu, Jul 20, 2023 at 7:18 PM Murilo Morais <murilo at evocorp.com.br>
> wrote:
>
>> Good evening everyone!
>>
>> I'm using OVS + VLAN Provider
>>
>> Guys, is there any way to remove IP from DHCP (network:dhcp)?
>>
>>
> You can create a subnet with enable_dhcp=False, then no DHCP port is
> allocated. Then let Neutron allocate addresses from the subnet range for
> your VMs (just make sure that the addresses are not reused outside of
> Neutron).
>
> My gateway is external, I need the VMs to obtain the IPs directly on the
>> interface without using SNAT/DNAT, but when enabling DHCP on the subnet,
>> the DHCP interface consumes an IP (the first one available).
>>
>> Is there a way to remove this blessed IP? If not, what other path can I
>> take?
>>
>> I'm thinking of other alternatives:
>> 1. Use static IP
>> 2. Use a DHCP Server on the Gateway (which makes me have to perform some
>> manual operations to assign the correct IP)
>>
>> What would be more viable?
>>
>> Thanks in advance!
>>
>
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