DCHP host entry with 2 IP's ?

[Paul Reilly]

Hello,

I'd like client computers to be able to move between subnets, and get an
appropriate IP address specific to that subnet.
The dhcpd.conf says you can have multiple fixed-addresses in the host entry,
and the DHCP server will provide the one which is viable on the subnet from
which the client is requesting a lease from.

I've tried this, but have not had much success in getting it to work.
I have two subnets, subnet 10 and subnet 20
Here's what I have.

subnet  x.y.10.10   netmask 255.255.255.0 {
 option subnet-mask 255.255.255.0;
option routers x.y.10.1;
max-lease-time 600;
default-lease-time 600;
}

subnet x.y.20.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option routers x.y.20.1;
max-lease-time 600;
default-lease-time 600;
}

host  myhost1     { hardware ethernet 00:1C:23:EE:C1:8E;  fixed-address
x.y.10.10,  x.y.20.10;}


How can I ensure that requests from subnet 10 get the x.y.10.10  address,
and requests from subnet 20 get the x.y.20.10  address?

Thanks
Paul
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