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This means that if you decide to allow outgoing Telnet
sessions, and if a client PC on the inside of a proxy server wants
to establish a Telnet session with a host on the outside of the
proxy server (the Internet side), a direct Telnet session between
the two machines will not be made. What does happen is that the
client PC will establish a Telnet session with the proxy server, the
proxy server will establish a separate session with the host on the
Internet, and the proxy server will pass information between the
two. As far as the client PC and the Internet host are concerned,
they are talking to each other directly; in reality, however, the
client PC is talking to the client side of the proxy server, and the
Internet host is talking to the Internet side of the proxy server.
The proxy server passes any traffic that we have previously
determined is allowable onto the other side, and, optionally, logs
all communications that have taken place. |
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