Over the coming years, there will probably be a gradual transition of the Internet from IPv4 to IPv6. During this transition phase, it is important that existing IPv4 applications continue to work with newer IPv6 applications. For example, a vendor cannot provide a
telnet client that works only with IPv6
telnet servers but must provide one that works with IPv4 servers and one that works with IPv6 servers. Better yet would be one IPv6
telnet client that can work with both IPv4 and IPv6 servers, along with one
telnet server that can work with both IPv4 and IPv6 clients. We will see how this is done in this chapter.
We assume throughout this chapter that the hosts are running dual stacks, that ...