Question

In Debian Linux, the iptables command is used to manage the built-in firewall. Describe how the iptables command can be used to:

• a.append a rule to reject all incoming TCP traffic to port 8088 (3 marks)
• b.show the list of the rules in the firewall after the change made in part (a) (2 marks).

Answer 1

a. iptables -A INPUT -p tcp --dport 8088 -j DROP

b. iptables -L -n -v

root@kali.~# iptables -L -n -v Chain INPUT (policy ACCEPT θ packets, θ bytes) pkts bytes target destination prot opt in out source Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target destination prot opt in out source Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target root@kali.뷰 iptables -A INPUT -p tcp --dport 8088 -j DROP root@kali.~# iptables -L -n -v Chain INPUT (policy ACCEPT 6 packets, 41340 bytes) destination prot opt in out source pkts bytes target out destination prot opt in source tcp dpt:8088 DROP Chain FORWARD (policy ACCEPT θ packets, θ bytes) pkts bytes target destination prot opt in out source Chain OUTPUT (policy ACCEPT 6 packets, 240 bytes) pkts bytes target root@kali : ~# out destination prot opt in source