My config files are 



PRIMARY SERVER CONFIG 


default-lease-time 600;
max-lease-time 7200;

failover peer "failover-partner" {
        primary;
        address 192.168.0.2;
        port 519;
        peer address 192.168.0.3;
        peer port 521;
        max-response-delay 60;
        max-unacked-updates 10;
        mclt 3600;
        split 128;
        load balance max seconds 3;
    }

omapi-port 7911;
omapi-key omapi_key;

key omapi_key {
     algorithm hmac-md5;
     secret  REMOVED;
}

subnet 192.168.0.0 netmask 255.255.255.0 {
 option routers 192.168.0.1;
 option domain-name-servers 192.168.0.2, 192.168.0.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.0-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.0.6 192.168.0.254;
        deny unknown-clients;
 }
}


subnet 192.168.1.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.1.1;
 option domain-name-servers 192.168.1.2, 192.168.1.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.1-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
         failover peer "failover-partner";
         range 192.168.1.6 192.168.1.254;
         deny unknown-clients;

 }
}

subnet 192.168.2.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.2.1;
 option domain-name-servers 192.168.2.2, 192.168.2.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.2-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.2.6 192.168.2.254;
        deny unknown-clients;

 }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.3.1;
 option domain-name-servers 192.168.3.2, 192.168.3.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.3-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.3.6 192.168.3.254;
        deny unknown-clients;
 }
}

subnet 192.168.4.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.4.1;
 option domain-name-servers 192.168.4.2, 192.168.4.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.4-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.4.6 192.168.4.254;
        deny unknown-clients;
 }
}

subnet 192.168.5.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.5.1;
 option domain-name-servers  192.168.5.2, 192.168.5.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.5-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.5.6 192.168.5.254;
        deny unknown-clients;
 }
}

subnet 192.168.6.0 netmask 255.255.255.0 {
 allow unknown-clients;
 option routers 192.168.6.1;
 option domain-name-servers 192.168.6.2, 192.168.6.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers 212.23.6.6,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.6-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.6.6 192.168.6.254;
        allow unknown-clients;
 }
}

subnet 192.168.7.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.7.1;
 option domain-name-servers  192.168.7.2, 192.168.7.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.7-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.7.6 192.168.7.254;
        deny unknown-clients;
 }
}

subnet 192.168.8.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.8.1;
 option domain-name-servers 192.168.8.2, 192.168.8.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.8-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.8.6 192.168.8.254;
        deny unknown-clients;
 }
}

subnet 192.168.253.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.253.1;
 option domain-name-servers  192.168.253.3, 192.168.253.4;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST2;
 log-facility local7;
 include "/etc/dhcp/192.168.253-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";

}
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
#include"/etc/dhcp/dhcp-static-leases.conf";





SECONDARY SERVER CONFIG

default-lease-time 600;
max-lease-time 7200;

failover peer "failover-partner" {
        secondary;
        address 192.168.0.3;
        port 521;
        peer address 192.168.0.2;
        peer port 519;
        max-response-delay 60;
        max-unacked-updates 10;
        load balance max seconds 3;
    }
omapi-port 7911;
omapi-key omapi_key;

key omapi_key {
     algorithm hmac-md5;
     secret  REMOVED;
}

subnet 192.168.0.0 netmask 255.255.255.0 {
 option routers 192.168.0.1;
 option domain-name-servers 192.168.0.2, 192.168.0.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.0-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.0.6 192.168.0.254;
        deny unknown-clients;
 }
}


subnet 192.168.1.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.1.1;
 option domain-name-servers 192.168.1.2, 192.168.1.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.1-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
         failover peer "failover-partner";
         range 192.168.1.6 192.168.1.254;
         deny unknown-clients;

 }
}

subnet 192.168.2.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.2.1;
 option domain-name-servers 192.168.2.2, 192.168.2.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.2-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.2.6 192.168.2.254;
        deny unknown-clients;

 }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.3.1;
 option domain-name-servers 192.168.3.2, 192.168.3.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.3-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.3.6 192.168.3.254;
        deny unknown-clients;
 }
}

subnet 192.168.4.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.4.1;
 option domain-name-servers 192.168.4.2, 192.168.4.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.4-dhcp-static-leases.conf";
# include"/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.4.6 192.168.4.254;
        deny unknown-clients;
 }
}

subnet 192.168.5.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.5.1;
 option domain-name-servers  192.168.5.2, 192.168.5.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.5-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.5.6 192.168.5.254;
        deny unknown-clients;
 }
}

subnet 192.168.6.0 netmask 255.255.255.0 {
 allow unknown-clients;
 option routers 192.168.6.1;
 option domain-name-servers 192.168.6.2, 192.168.6.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers 212.23.6.6,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.6-dhcp-static-leases.conf";
 include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.6.6 192.168.6.254;
        allow unknown-clients;
 }
}

subnet 192.168.7.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.7.1;
 option domain-name-servers  192.168.7.2, 192.168.7.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.7-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.7.6 192.168.7.254;
        deny unknown-clients;
 }
}

subnet 192.168.8.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.8.1;
 option domain-name-servers 192.168.8.2, 192.168.8.3;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.8-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";
 pool {
        failover peer "failover-partner";
        range 192.168.8.6 192.168.8.254;
        deny unknown-clients;
 }
}

subnet 192.168.253.0 netmask 255.255.255.0 {
 deny unknown-clients;
 option routers 192.168.253.1;
 option domain-name-servers  192.168.253.3, 192.168.253.4;
 option domain-name "mydomain";
 option domain-search ".", "mydomain";
 option ntp-servers NTPHOST1,  NTPHOST1;
 log-facility local7;
 include "/etc/dhcp/192.168.253-dhcp-static-leases.conf";
# include "/etc/dhcp/BANNED-MACs-dhcp-static-leases.conf";