No consigo arrancar el servidor DHCP

[José Troncoso]

Estoy haciendo unas pruebas y no consigo arrancar el servidor DHCP. Me dice 
que no está configurado para escuchar en ninguna interfaz. Agradecería mucho 
que alguien pudiese orientarme. Esta es la configuración y el error:

***  ifconfig wlan0  ***

wlan0     Link encap:Ethernet  HWaddr 00:80:C8:2D:C1:08
          inet addr:69.56.103.229  Bcast:69.56.103.255  Mask:255.255.255.0
          inet6 addr: fe80::280:c8ff:fe2d:c108/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3953 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1937 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1342250 (1.2 MiB)  TX bytes:356279 (347.9 KiB)
          Memory:f6020000-f6021fff

***  /var/log/daemon.log  ***

May  3 10:46:51 atenas4 dhcpd: Internet Systems Consortium DHCP Server V3.0.2
May  3 10:46:51 atenas4 dhcpd: Copyright 2004 Internet Systems Consortium.
May  3 10:46:51 atenas4 dhcpd: All rights reserved.
May  3 10:46:51 atenas4 dhcpd: For info, please visit 
http://www.isc.org/sw/dhcp/
May  3 10:46:51 atenas4 dhcpd: Wrote 231 leases to leases file.
May  3 10:46:51 atenas4 dhcpd:
May  3 10:46:51 atenas4 dhcpd: No subnet declaration for wlan0 
(69.56.103.229).
May  3 10:46:51 atenas4 dhcpd: ** Ignoring requests on wlan0.  If this is not 
what
May  3 10:46:51 atenas4 dhcpd:    you want, please write a subnet declaration
May  3 10:46:51 atenas4 dhcpd:    in your dhcpd.conf file for the network 
segment
May  3 10:46:51 atenas4 dhcpd:    to which interface wlan0 is attached. **
May  3 10:46:51 atenas4 dhcpd:
May  3 10:46:51 atenas4 dhcpd:
May  3 10:46:51 atenas4 dhcpd: Not configured to listen on any interfaces!

***  /etc/default/dhcp3-server  ***

INTERFACES="wlan0"

***  /etc/dhcp3/dhcpd.conf  ***

default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 69.56.103.255;
option routers 69.56.103.1;
option domain-name-servers 69.55.2.40, 69.50.2.190;
#option domain-name "mydomain.org";
subnet 69.56.103.0 netmask 255.255.255.0 {
   range 69.56.103.10 69.56.103.100;
}

Un saludo,
José Troncoso