Testing_Lab8-v6

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Stanford University *

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Information Systems

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Dec 6, 2023

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docx

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Uploaded by SuperHumanWaterAlbatross9

1. Tasks (Assignment) As part of the lab assignment, you are expected to answer the following questions by providing a short report . 1 - Add a new IPTables rule to prevent outgoing traffic to port 80, and test the rule to make sure it is working. Provide (in your report) screenshots listing the rules and the test results . First, we tried to connect with www.google.com via port 80 using telnet www.google.com 80. We are able to connect after conducting the test Next, we add the rule as requested: sudo iptables -A OUTPUT -p tcp —dport 80 -j DROP And check to ensure the rule is confirmed using sudo iptables -L Conduct another connection test using command telnet www.google.c om 80 and 1

rec eiv ed bel ow res ult. Thi s sh ow s the rule is wo rki ng 2 - Write a rule to accept all packets incoming on a particular interface, for example eth0 or localhost. Provide (in your report) screenshots listing the rules and the test results . Using sudo iptables -F to clear all rules from previous task. Afterward, we add the new rule as requested using sudo iptables -A INPUT -i eth0 -j ACCEPT To confirm, we connect to www.google.com using telnet www.google.com 80. Connection was established, meaning the rule is working 3 - What is the meaning of the following IPTables rules ? a ( iptables -A INPUT -s 192.168.0.4 -j ACCEPT The command is allowing incoming packets from IP address 192.168.0.4 to reach the system by adding a rule to the firewall's INPUT chain . b) iptables -A INPUT -s 192.168.0.4 -m mac --mac-source 00:50:8D:FD:E6:32 -j ACCEPT 2

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