PPT Slide
- When a source host establishes a connection to a destination host, the TCP/IP packets carry out only IP addresses of the source host;
- For authentication, access rights or accounting information, the destination host wants to know the name of the source host;
- For this purpose, a special domain “in-addr.arpa” is used;
- The reverse name is obtained by reversing the IP number and adding the name “in-addr.arpa”;
- Example: address: 130.65.240.254
reverse name: 254.240.65.130.in-addr.arpa
- Reverse domains form a hierarchical tree and are treated as any other Internet domain.
- Rfc2317 Classless In-ADDR.ARPA delegation