failover for mixed subnets

[Luc T.]

Hi, I am setting up failover for a mixed subnet, which provides both dynamic IPs and static IP according to host mac address. Following is the conf for the primary server:
   
  authoritative;
option domain-name "jkkj.ca";
option domain-name-servers 192.168.1.2;
default-lease-time 14400;
ddns-update-style none;
 
failover peer "dhcp-failover-1" {
  primary; # declare this to be the primary server
  address 192.168.1.2;
  port 520;
  peer address 192.168.1.6;
  peer port 520;
  max-response-delay 30;
  max-unacked-updates 10;
  load balance max seconds 3;
  mclt 1800;
  split 128;
}
   
  subnet 192.168.1.0 netmask 255.255.255.0 {
 
 pool{
     deny dynamic bootp clients;
      failover peer "dhcp-failover-1";
    range 192.168.1.101 192.168.1.199;
}
         
        host 0014389390E2 { hardware ethernet 00:14:38:93:90:E2; fixed-address 192.168.1.12;}
        host 0014389390E3 { hardware ethernet 00:14:38:93:90:E2; fixed-address 192.168.1.13;}
        host 0014389390E4 { hardware ethernet 00:14:38:93:90:E2; fixed-address 192.168.1.14;}
        host 0014389390E5 { hardware ethernet 00:14:38:93:90:E2; fixed-address 192.168.1.15;}
        host 0014389390E6 { hardware ethernet 00:14:38:93:90:E2; fixed-address 192.168.1.16;}
}
   
   
  My questions are:
  1. for the static part, namely 192.168.1.12 to 192.168.1.16, how can I set up failover?
  2. do I have to create a pool? Can I use following configuration for the subnet:
   
  subnet 192.168.1.0 netmask 255.255.255.0 {
    deny dynamic bootp clients;
      failover peer "dhcp-failover-1";
    range 192.168.1.101 192.168.1.199;
}
   
  3. In addition, how can the two servers know the other is down or up, by ping?
   
  Thanks!