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INTERVIEW QUESTIONS
NETWORKING
TCP/IP
DETAILS
Question: Can I set up a gateway to the Internet that translates IP addresses, so that I don't have to change all our internal addresses to an official network?
Answer: This is called Network Address Translation, or NAT. In general it is a difficult thing to do properly because many applications embed IP addresses in the application-level data (FTP's "PORT" command is a notable example) so NAT isn't simply a matter of translating addresses in the IP header and recalculating header checksums. Also, if the network number(s) you're using match those assigned to another organisation, your gateway may not be able to communicate with that organisation. As noted above, RFC 1918 proposes network numbers that are reserved for private use, to avoid such conflicts, but if you're already using a different network number this won't help you.
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TCP/IP Interview Questions & Answers -
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Question:
Can I set up a gateway to the Internet that translates IP addresses, so that I don't have to change all our internal addresses to an official network?
Answer:
This is called Network Address Translation, or NAT. In general it is a difficult thing to do properly because many applications embed IP addresses in the application-level data (FTP's "PORT" command is a notable example) so NAT isn't simply a matter of translating addresses in the IP header and recalculating header checksums. Also, if the network number(s) you're using match those assigned to another organisation, your gateway may not be able to communicate with that organisation. As noted above, RFC 1918 proposes network numbers that are reserved for private use, to avoid such conflicts, but if you're already using a different network number this won't help you. Source: CoolInterview.com
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