CCNA Practice LAB – Dynamic NAT

Network Topology Diagram:

Cable Connectivity:

  • Cross cable connectivity between R1 and R2 & R2 and Web Server
  • Straight cable elsewhere.

Basic Configuration:

On SW1

# interface FastEthernet0/1
# switchport access vlan 10
# interface FastEthernet0/2
# switchport access vlan 10
# interface FastEthernet0/3
# switchport access vlan 10
# interface Vlan10
# ip address 10.10.10.250 255.255.255.0

In PCs – Configure IP address as shown in picture and default gateway as Router R1

On R1
# interface FastEthernet0/0
# ip address 10.10.10.254 255.255.255.0
# interface FastEthernet1/0
# ip address 200.20.20.1 255.255.255.0
# ip route 0.0.0.0 0.0.0.0 200.20.20.2

On R2
# interface FastEthernet0/0
# ip address 172.20.20.254 255.255.255.0
# interface FastEthernet1/0
# ip address 200.20.20.2 255.255.255.0
# ip route 0.0.0.0 0.0.0.0 200.20.20.1

 

Scenario I: Learn Dynamic NAT – Access Web Server 200.20.20.2 from any PC and practice how packets are translated on R1.

Tip: Remember that Static NAT is configured at R2, hence you need to access Web Server on IP address 200.20.20.2 in order to understand Dynamic NAT.

Dynamic NAT Configuration:
# ip nat pool DYNAMIC_NAT 200.20.20.10 200.20.20.20 netmask 255.255.255.0
# ip nat inside source list 1 pool DYNAMIC_NAT
# interface FastEthernet0/0
# ip access-group 1 in

Download CCNA Practice Lab -Dynamic NAT – 78.8 KB

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