Reading the linux-netdev archives ( http://marc.info/?l=linux-
netdev&m=124836694205107&w=2 );

 "ISC dhcp3d [sic] does not use libpcap, and does not query the packet
socket for the VLAN tag, so it treats every VLAN's packets as for the
default VLAN.".

This is just as the OP describes. So unless the behaviour of the raw
interface changes back to the old way or ISC adopts libpcap, then a
single instance of dhcpd will never be able to handle the default
interface with additional VLAN interfaces off the same NIC.

A suggested enhancement/workaround would be to have out-of-the-box
support for an instance per interface.

-- 
dhcp3-server vlan support seems to be broken
https://bugs.launchpad.net/bugs/295520
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