First I need to gather a little information.
It sounds like you have two subnets connected to the same switch which are
then connected to one ethernet port that has an alias on it.
Why are you using two subnets? If you need dhcp on both subnets when a
client connects to network it will make a broadcast dhcp query to get an ip
address. So any dhcp server listening on either 192.168.4.0/24 or
192.168.6.0/24 will respond.
There will be a race condition. The first reply received is the one that
that computer will use.
It's hard to understand exactly what you're trying to accomplish, but I get
the feeling that you want to have a network with mixed static ips and
dynamic ips.
For that you could use one single net: 192.168.6.0/24, then just configure
your dhcpd server to only select dynamic ips from a pool like:
192.168.6.50-192.168.6.254
If you want to keep your current setup you can force the dhcp server to
only listen on a specific interface.
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