redes

NAT
ip dhcp pool Clientes
 network 10.0.10.0 255.255.255.0
 default-router 10.0.10.1
 dns-server 10.0.10.200
!

interface FastEthernet0/0
 ip address 10.0.10.1 255.255.255.0
 ip nat inside!
interface FastEthernet0/1
 ip address dhcp
 ip nat outside
!
ip nat inside source list 10 interface FastEthernet0/1 overload
ip nat inside source static 10.0.10.200 200.200.201.100 
!access-list 10 permit 10.0.10.0 0.0.0.255
!
!

GNS3:
ip nat inside source static tcp 10.0.10.200 8080 interface FastEthernet0/1 80
ip nat inside source static tcp 10.0.10.201 21 interfaceFastEthernet0/1 21
ip nat inside source static tcp 10.0.10.201 20 interface FastEthernet0/1 20
!======================================

Wildcard Mask

Network Mask: 
0----00000000
128--10000000192--11000000
224--11100000
240--11110000
248--11111000
252--11111100
254--11111110
255--11111111

Wildcard Mask:
0----11111111--255
128--01111111--127
192--00111111--63
224--00011111--31240--00001111--15
248--00000111--7
252--00000011--3
254--00000001--1
255--00000000--0

Opera:

bits en apagados (ceros "0"):
bits en encendidos (unos "1"):


Permitir la red 192.168.1.0/24:11000000.10101000.00000001.00000000
00000000.00000000.00000000.11111111

access-list 90 permit 192.168.1.0 0.0.0.255

Permitir el rango de hosts 192.168.1.64 - 192.168.1.127:11000000.10101000.00000001.01000000
00000000.00000000.00000000.00111111

access-list 91 permit 192.168.1.64 0.0.0.63

Permitir a todos los hosts que terminen en .248 y .249 de la red 192.168.0.0/1611000000.10101000.00000000.11111000
00000000.00000000.11111111.00000001

access-list 20 permit 192.168.0.248 0.0.0.1

Permitir la IP 10 de cada una de las siguientes redes:
10.0.0.0/24
10.0.1.0/2410.0.2.0/24
10.0.3.0/24
10.0.4.0/24
10.0.5.0/24
10.0.6.0/24
10.0.7.0/24

00001010.00000000.00000000.00001010
00000000.00000000.00000111.00000000

access-list 10 permit 10.0.0.10 0.0.7.0
DHCP
En...