Seguridad y Redes

• Configuramos una IP a la interface del Servidor
• Definimos el nombre del Servidor
• Establecemos el rango de direcciones IPs de la red
• Definimos la puerta de enlace
• Define el servidor de nombres DNS
• Establecemos la dirección(es) dentro del rango que no se debe de asignar

Topologia en GNS3

Servidor DHCP

Server_DHCP#conf t
Server_DHCP(config)#int f0/0
Server_DHCP(config-if)#ip add 192.168.1.1 255.255.255.0
Server_DHCP(config-if)#no shut
Server_DHCP(config-if)#exit
Server_DHCP(config)#ip dhcp pool delfirosales
Server_DHCP(dhcp-config)#network 192.168.1.0 255.255.255.0
Server_DHCP(dhcp-config)#default-route 192.168.1.1
Server_DHCP(dhcp-config)#dns-server 192.168.1.1
Server_DHCP(dhcp-config)#exit
Server_DHCP(config)#ip dhcp excluded-address 192.168.1.1

Configuración en SW, R1, R2

RX#conf t
RX(config)#int f0/0
RX(config-if)#no shut
RX(config-if)#ip address dhcp
RX(config-if)#

*Mar  1 00:00:51.203: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.1.3, mask 255.255.255.0, hostname R2

Qemu Host (Microcore) utiliza la utilidad udhcpc como cliente dhcp.
Para verificar que se esta ejecutando udhcpc, utilizar el siguiente comando.

ps | grep udhcpc

1649  root  /sbin/udhcpc -b -i eth0 -h box -p /var/run/udhcpc.eth0.pid
1663  root  greep udhcpc

Qemu Host (Microcore) automáticamente detecta la IP.

Por ultimo verificamos.

Server_DHCP#show ip dhcp binding      
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
               Hardware address/
               User name
192.168.1.2         0063.6973.636f.2d63.    Mar 02 2002 12:05 AM    Automatic
               3230.362e.3232.3134.
               2e30.3030.302d.4661.
               302f.30
192.168.1.3         0063.6973.636f.2d63.    Mar 02 2002 12:09 AM    Automatic
               3230.372e.3232.3134.
               2e30.3030.302d.4661.
               302f.30
192.168.1.4         0063.6973.636f.2d63.    Mar 02 2002 12:09 AM    Automatic
               3230.332e.3232.3134.
               2e30.3030.302d.566c.
               31
192.168.1.5         0100.aa00.fa9f.00       Mar 02 2002 12:12 AM    Automatic
Server_DHCP#show ip dhcp pool         

Pool delfirosales :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 254
Leased addresses               : 4
Pending event                  : none
1 subnet is currently in the pool :
Current index        IP address range                    Leased addresses
192.168.1.6          192.168.1.1      - 192.168.1.254     4
Server_DHCP#

Server_DHCP#show run

!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 192.168.1.1
!
ip dhcp pool delfirosales
network 192.168.1.0 255.255.255.0
default-router 192.168.1.1
dns-server 192.168.1.1
!