====== Configuracion DHCP-BIND ======

Receta para servidor DHCP con registros dinamicos en un servidor BIND.

Está realizado con ubuntu-server 10.04

===== Configuración previa =====

   apt-get install bind9 dhcp3-server

==== Crear llave de actualizacion DNS ====

   # dnssec-keygen -a hmac-md5 -b 128 -n USER dynamic-key
   Kdynamic-key.+157+14638
   #
   # cat Kdynamic-key.+157+14638.key
   dynamic-key. IN KEY 0 3 157 N8Hk2RUFO84bEVl3uGTD2A== 
   #
   cp Kdynamic-key.+157+14638.key /etc/bind/dynamic.key
   #
   # chown bind /etc/bind/dynamic.key
   #

===== Configuración Bind 9 =====

==== /etc/bind/named.conf.local ====

   controls {
        inet 127.0.0.1 allow {localhost; } keys { "dynamic-key"; };
   };


   // Definición de la zona dinamica aqui
   zone "network.micasa" {
        type master;
        file "network.micasa.zone";
        allow-update { key "dynamic-key"; };
        notify yes;
   };
   
   zone "0.168.192.in-addr.arpa" {
        type master;
        file "192.micasa.zone";
        allow-update { key "dynamic-key"; };
        notify yes;
   };
   
   include "/etc/bind/dynamic.key";

==== /etc/bind/dynamic.key ====

   key "dynamic-key" {
        algorithm       hmac-md5;
        secret          "lgkbhjhtthgtlghtl6567==";
   };

==== /var/cache/bind/network.micasa.zone ====

Hacer dos **network.micasa.zone** y **192.micasa.zone** con este contenido

   $TTL 86400	; 1 dia
   @     IN SOA	server.network.micasa. root.network.micasa. (
                200806327  ; serial
                28800      ; refresh (8 hours)
                7200       ; retry (2 hours)
                2419200    ; expire (4 weeks)
                86400      ; minimum (1 day)
                )
   
          IN NS	server.network.micasa.
         
   server IN A  192.168.0.2      

   # chgrp bind network.micasa.zone 192.micasa.zone
   #
   # /etc/init.d/bind9 restart | tail -f /var/log/daemon.log

==== Probar DNS dinamico ====

   # nsupdate
   > server localhost
   > key dynamic-key N8Hk2RUFO84bEVl3uGTD2A==
   > zone network.micasa
   > update add feliz.network.micasa. 600 IN A 192.168.0.50
   > send

   # dig @localhost feliz.network.micasa
   
   ;;ANSWER SECTION
   feliz.network.micasa.   600   IN   A   192.168.0.50

===== Configuracion DHCP server =====

==== Disponibilizar key ====

   # cd /etc/dhcp3
   # ln /etc/bind/dynamic.key

(dhcpd corre enjaulado, aparentemente, y necesita tener la clave en su directorio)

==== /etc/default/dhcp3-server ====

   INTERFACES="eth0"

==== /etc/dhcp3/dhcpd.conf ====

Tocar estas lineas:

   server-identifier           server;
   ddns-updates                on;
   ddns-update-style           interim;
   ddns-domainname             "network.mycasa.";
   ddns-rev-domainname         "in-addr.arpa.";
   ignore                      client-updates;
   
   include                     "/etc/dhcp3/dynamic.key";
   
   zone 0.168.192.in-addr.arpa. {
       primary 127.0.0.1;
       key "dynamic-key";
   }
   
   zone network.micasa. {
       primary 127.0.0.1;
       key "dynamic-key";
   }
   
   option domain-name "network.micasa";
   option domain-name-servers server.network.micasa;
   
   subnet 192.168.0.0 netmask 255.255.255.0 {
    range                       192.168.0.100 192.168.0.200;
    option broadcast-address    192.168.0.255;
    option routers              192.168.0.1;
    allow                       unknown-clients;
   }







===== Referencias =====

  * http://www.debian-administration.org/article/343/Configuring_Dynamic_DNS__DHCP_on_Debian_Stable
  * http://www.semicomplete.com/articles/dynamic-dns-with-dhcp/