a) A user on the internet with IP address 125.1.2.7 wants to browse a webpage on

Question

a) A user on the internet with IP address 125.1.2.7 wants to browse a webpage on the webserver. The user enters the address http://14.1.2.4 in a web browser; will the user be able to successfully access the webpage?
b)
? If Yes, explain your answer.
? If No, what should be the correct address that the user needs to enter in order to be able to successfully access the webpage, given the above NAT translation table? How should the NAT translation table be modified so that the user’s original address in (a) will work successfully?

5. Examine the below network diagram and the corresponding NAT translation table with IP and port number) LAN WAN 14.1.2.1/24 125.1.2.7 NAT Webserver Router Internet 172.16.0.1 NAT Translation Table WAN side LAN side 172.16.0.1, 80 14.1.2.4, 5998

Explanation / Answer

No, the website will not open. First of all if we start by looking for a website we should always use the LAN side or the local IP address as given in the NAT table. The request first goes to the Gateway and the Local address of the website will always be on the same IP Class as of the gateway.

The NAT table will then convert that Local IP to the Global IP which will be in the same Class as the original IP address of the website. And NAT will link the two addresses of the website. So the correct address that the user should enter will be 172.16.0.1 which I think could be the address of gateway in private C class IP range.

Regarding the changes in the NAT table, all we can do is when the reply comes from the website, we can make an another Row in the NAT table and CIDR can be implemented which can migrate between adresses with ease.

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