Suppose you want your firewall to block all incoming Telnet connections but to allow outbound Telnet connections. One approach would be to block all inbound packets to the designated Telnet port (23). (a) We might want to block inbound packets to other ports as well, but what inbound TCP connections must be permitted in order not to interfere with outbound Telnet? (b) Now suppose your firewall is allowed to use the TCP header Flags bits in addition to the port numbers. Explain how you can achieve the desired Telnet effect here while at the same time allowing no inbound TCP connections.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Suppose you want your firewall to block all incoming Telnet
connections but to allow outbound Telnet connections. One
approach would be to block all inbound packets to the
designated Telnet port (23).
(a) We might want to block inbound packets to other ports as
well, but what inbound TCP connections must be permitted
in order not to interfere with outbound Telnet?
(b) Now suppose your firewall is allowed to use the TCP header
Flags bits in addition to the port numbers. Explain how you
can achieve the desired Telnet effect here while at the same
time allowing no inbound TCP connections.
Transcribed Image Text:Suppose you want your firewall to block all incoming Telnet connections but to allow outbound Telnet connections. One approach would be to block all inbound packets to the designated Telnet port (23). (a) We might want to block inbound packets to other ports as well, but what inbound TCP connections must be permitted in order not to interfere with outbound Telnet? (b) Now suppose your firewall is allowed to use the TCP header Flags bits in addition to the port numbers. Explain how you can achieve the desired Telnet effect here while at the same time allowing no inbound TCP connections.
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