failover - reserved address

Pavel Mlčoch pavkamlc at
Mon May 18 13:14:14 UTC 2009


 I've problem with migrate our configuration from reserved ip address into
failover configuration. Is possible to solve it?

 Today we have this configuration:



option domain-name "";

option domain-name-servers,;

option routers;

authoritative ;

ddns-update-style none;

default-lease-time 3600;

max-lease-time 259200;


subnet netmask {

        option routers;



  hardware ethernet 00:a0:c9:ed:1d:f7;





I tried remake this configuration for failover, server works, but I'm afraid
about address reservation. Our systems depend on statically defined IP
address, but in failover configuration is used leastime so in future is
possible to address has been changed. I read about infinite-is-reserved, but
I don't find way howto migrate fixed-address records into reserved leases.


#CentOS 5.3


ddns-update-style none;


failover peer "dhcp-failover" {

  primary; # declare this to be the primary server


  port 647;

  peer address;

  peer port 647;

  max-response-delay 30;

  max-unacked-updates 10;

  load balance max seconds 3;

  mclt 1800;

  split 128;



subnet netmask {

  option subnet-mask;

  option broadcast-address;

  option routers;

  option domain-name-servers,;

  pool {

    failover peer "dhcp-failover";


    max-lease-time 4294967295; # infinite


    deny dynamic bootp clients;



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