Step 9: Configure NAT Overload on Router0 and Router2
NOTE: The line 3 command designates the subnet that has access to use NAT. The line 4 command
assigns the access-list ACL from line 3 to a specific port. The line 5 command changes to interface
fastethernet0/0 to configure it. The line 6 command specifies the interface that is used for the inside
Private network. The line 7 command changes to interface Serial2/0 to configure it. and line 8
outside specifies the interface that is used for the outside Public network.
1) Click on Router0 and click the CLI Tab.
2) If you do not see the R0 (config)# prompt, type en and hit Enter, then type conf t and hit Enter.
3) Type access-list 1 permit 192.168.100.0 0.255.255.255 and hit Enter.
4) Type ip nat inside source list 1 interface s2/0 overload and hit Enter.
5) Type int fa0/0 and hit Enter.
6) Type ip nat inside and hit Enter.
7) Type int s2/0 and hit Enter.
8) Type ip nat outside and hit Enter.
9) Click on Router2 and click the CLI Tab.
10) If you do not see the R2 (config)# prompt, type en and hit Enter, then type conf t and hit Enter.
11) Type access-list 1 permit 10.0.0.0 0.0.0.255 and hit Enter.
12) Type ip nat inside source list 1 interface s2/0 overload and hit Enter.
13) Type int fa0/0 and hit Enter.
14) Type ip nat inside and hit Enter.
15) Type int s2/0 and hit Enter.
16) Type ip nat outside and hit Enter.
Step 10: Configure Static NAT on Router1 to give server a Public IP
NOTE: Static NAT allows us to use the Internet Facing Router to allow a one-to-one mapping of
its Public IP address to the internal Web Server, so that users on the internet will have a Public IP
address to connect to.
1) Click on Router1 and click the CLI Tab.
2) If you do not see the R1 (config)# prompt, type en and hit Enter, then type conf t and hit Enter.
3) Type ip nat inside source static 172.16.10.10 23.23.23.1 and hit Enter.
4) Type int fa0/0 and hit Enter.
5) Type ip nat inside and hit Enter.
6) Type int s2/0 and hit Enter.
7) Type ip nat outside and hit Enter.
Step 11: Test the Network to see if it is working
1) Switch to Simulation mode by selecting the tab that is partially hidden behind the Realtime tab in
the bottom right-hand corner. The tab has the icon of a stopwatch on it.
2) Click the Edit Filters button in the Event List Filters area. Clicking the Edit Filters button will
create a pop-up window. In the pop-up window, click the Show All/None box to deselect every filter.
Select just the ARP and ICMP filters from IPv4.
3) Select a Simple PDU by clicking the closed envelope on the right vertical toolbar. Move your cursor
to the display area of your screen. Click 192.168.100.100 to establish the source. Move your cursor to
21.21.21.1 and click to establish the connection.
NOTE: Notice that two envelopes are now positioned beside PC-A. One envelope is ICMP, while
the other is ARP. The event List in the Simulation Panel will identify exactly which envelope
represents ICMP and which represents ARP.
4) Select Auto Capture / Play from the Play Controls area of the Simulation Panel. Below the Auto
Capture / Play button is a horizontal bar, with a vertical button that controls the speed of the
simulation. Dragging the button to the right will speed up the simulation, while dragging it to the left
will slow down the simulation.
5) The animation will run until the messages window Buffer Full – Packet Tracer appears. The
maximum number of events has been reached. Select View Previous Results to close it.
6) Hit Reset Simulation and try it a few more times, but this time, try from different computers to see if
the simulation will work between all computers (laptop, and server also). Also try to communicate
with any of the routers.
7) Hit the Delete button to delete the simulation.
8) Click on any computer, or laptop and click on the Desktop Tab. Then click Web Browser.
9) Type in 23.23.23.1 and hit Enter. You should now be able to reach the Web Server.
These are the steps that confuse me
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