Mine

authoritative;
ddns-update-style interim;
ignore client-updates;
default-lease-time 86400;
max-lease-time 86400;

#INTERFACE 192.168.0.0/24
#The address of this interface (xl0) is 192.168.0.2

subnet 192.168.1.0 netmask 255.255.255.0 {
}

subnet 192.168.0.0 netmask 255.255.255.0 {
   range 192.168.0.1 192.168.0.254;
   option routers 192.168.0.2;          #Change this to the internal IP address of the gateway
   option ip-forwarding off;
   option broadcast-address 192.168.0.255;
   option subnet-mask 255.255.255.0;
   option domain-name-servers 61.1.96.69, 199.166.28.10;        #Assuming that the DHCPD box is also your nameserver
   option domain-name "hostname.munged.here";
}


#INTERFACE rl1 192.168.2.0/24
#The address of this interface (rl1) is 192.168.2.2

subnet 192.168.2.0 netmask 255.255.255.0 {
   range 192.168.2.1 192.168.2.254;
   option routers 192.168.2.2;          #Change this to the internal IP address of the gateway
   option ip-forwarding off;
   option broadcast-address 192.168.2.255;
   option subnet-mask 255.255.255.0;
   option domain-name-servers 61.1.96.69, 199.166.28.10;        #Assuming that the DHCPD box is also your nameserver
   option domain-name "hostname.munged.here.";
}


host xpbox {
  hardware ethernet 00:13:d4:fc:9f:ef;
  server-name "hostname.munged.here";
  fixed-address 192.168.0.3;