Linux sets up a virtual interface for every VLAN defined. So what he means is
that he has one physical interface configured with different VLANs. That
should work: Kea can be configured to listen on the virtual interfaces. It
does mean the server needs an IP address in each VLAN, and so on each virtual
interface.
It also, of course, depends on the VLAN tagged broadcast packets arriving on
the physical interface which appears to be the problem here. That can be
confirmed with tcpdump.
Graham
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