DHCP configured in a number of gateway, the gateway is how to allocate,
For example:
Subnet configures 192.168.1.0 netmask 255.255.255.0 {
The range 192.168.1.10 192.168.1.100;
Option routers 192.168.1.1 192.168.1.2 instead 192.168.1.3;
}