5.a friend's machine at 192.168.34.37 is unable to send you email due to a blocked connection?
4. Explain the significance of the rule "iptables -A INPUT -s 192.168.34.37 -j ACCEPT"
3. Describe the command used to block communication from a specific IP address to your machine
2. What does "iptables -P FORWARD DROP," do? how does it affect the packet-filtering system
1. Can you explain how the iptables system works in practice?
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