Monday, 2 March 2015

To configure static NAT

Follow this step by step static NAT configure




Configure ip address on PC and Server as given in figure



















Now configure R1 exactly given here


Router>enable
Router#configure terminal
Router(config)#hostname R1
R1(config)#interface fastethernet 0/0
R1(config-if)#ip address 10.0.0.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface serial 0/0/0
R1(config-if)#ip address 20.0.0.2 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#ip route 30.0.0.0 255.0.0.0 20.0.0.1
R1(config)#ip nat inside source static 10.0.0.2 50.0.0.1
R1(config)#interface fastEthernet 0/0
R1(config-if)#ip nat inside
R1(config-if)#exit
R1(config)#interface serial 0/0/0
R1(config-if)#ip nat outside
R1(config-if)#exit
R1(config)#

Now configure R0 exactly given here
Router>enable
Router#configure terminal
Router(config)#hostname R0
R0(config)#interface fastethernet 0/0
R0(config-if)#ip address 30.0.0.1 255.0.0.0
R0(config-if)#no shutdown
R0(config-if)#exit
R0(config)#interface serial 0/0/0
R0(config-if)#ip address 20.0.0.1 255.0.0.0
R0(config-if)#clock rate 64000
R0(config-if)#bandwidth 64
R0(config-if)#no shutdown
R0(config-if)#exit
R0(config)#ip route 50.0.0.0 255.0.0.0 20.0.0.2
R0(config)#
As you have seen in configuration there is not direct route for 10.0.0.2. So PC from network of 30.0.0.0 will never know about it. They will access 50.0.0.1 as the web server IP. To test it double click on any computer and ping from 50.0.0.1 and you will get replay.
Packet Tracer PC Command Line 1.0
PC>ping 50.0.0.1
Pinging 50.0.0.1 with 32 bytes of data:
Reply from 50.0.0.1: bytes=32 time=141ms TTL=126
Reply from 50.0.0.1: bytes=32 time=80ms TTL=126
Reply from 50.0.0.1: bytes=32 time=109ms TTL=126
Reply from 50.0.0.1: bytes=32 time=125ms TTL=126

Ping statistics for 50.0.0.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 80ms, Maximum = 141ms, Average = 113ms
Now ping from 10.0.0.2 and you will get destination host unreachable error.
PC>ping 10.0.0.2
Pinging 10.0.0.2 with 32 bytes of data:
Reply from 30.0.0.1: Destination host unreachable.
Reply from 30.0.0.1: Destination host unreachable.
Reply from 30.0.0.1: Destination host unreachable.
Reply from 30.0.0.1: Destination host unreachable.

Ping statistics for 10.0.0.2:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)


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