Datasheet

Lab – Configuring Dynamic and Static NAT
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Appl doors: 0
Normal doors: 0
Queued Packets: 0
Step 4: Define the pool of usable public IP addresses.
Gateway(config)# ip nat pool public_access 209.165.200.242 209.165.200.254
netmask 255.255.255.224
Step 5: Define the NAT from the inside source list to the outside pool.
Note: Remember that NAT pool names are case-sensitive and the pool name entered here must match
that used in the previous step.
Gateway(config)# ip nat inside source list 1 pool public_access
Step 6: Test the configuration.
a. From PC-B, ping the Lo0 interface (192.31.7.1) on ISP. If the ping was unsuccessful, troubleshoot and
correct the issues. On the Gateway router, display the NAT table.
Gateway# show ip nat translations
Pro Inside global Inside local Outside local Outside global
--- 209.165.200.225 192.168.1.20 --- ---
icmp 209.165.200.242:1 192.168.1.21:1 192.31.7.1:1 192.31.7.1:1
--- 209.165.200.242 192.168.1.21 --- ---
What is the translation of the Inside local host address for PC-B?
192.168.1.21 = _________________________________________________________ 209.165.200.242
A dynamic NAT entry was added to the table with ICMP as the protocol when PC-B sent an ICMP
message to 192.31.7.1 on ISP.
What port number was used in this ICMP exchange? ______________ 1, answers will vary.
b. From PC-B, open a browser and enter the IP address of the ISP-simulated web server (Lo0 interface).
When prompted, log in as webuser with a password of webpass.
c. Display the NAT table.
Pro Inside global Inside local Outside local Outside global
--- 209.165.200.225 192.168.1.20 --- ---
tcp 209.165.200.242:1038 192.168.1.21:1038 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1039 192.168.1.21:1039 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1040 192.168.1.21:1040 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1041 192.168.1.21:1041 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1042 192.168.1.21:1042 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1043 192.168.1.21:1043 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1044 192.168.1.21:1044 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1045 192.168.1.21:1045 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1046 192.168.1.21:1046 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1047 192.168.1.21:1047 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1048 192.168.1.21:1048 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1049 192.168.1.21:1049 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1050 192.168.1.21:1050 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1051 192.168.1.21:1051 192.31.7.1:80 192.31.7.1:80
tcp 209.165.200.242:1052 192.168.1.21:1052 192.31.7.1:80 192.31.7.1:80