On 18/08/2025 13:49, Kevin wrote:
Hello
We need to implement multi tenancy at the DHCP level. It means the same subnet
(e.g 10.0.0.0/24) might be used by several clients and both should be able to
get a lease for 10.0.0.1.
We planned to implement this by relying on the Circuit-Id to help us
distinguish which subnet to choose from.
Unfortunately, we did not manage to make it work. Can you confirm this feature
(reusing the same subnet several times) is not currently possible?
Not the maintainer, but dnsmasq only has a single DHCP lease database (a
single IP -> client mapping). What you want is to have several of them,
which is not possible with a single instance of dnsmasq.
The circuit-id in the DHCP relay agent information option isn't designed
for that either. It's primary purpose is to help a dumb DHCP relay to
forward the response from the server to the correct downtream interface
in cases the downstream interfaces do not have their own routable IP
addresses. Using it to select distinct DHCP databases on a server is
really not what the RFC intended, you better know what you are doing.
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