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$ sudo apt-get update
$ sudo apt-get install iptables

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$ sudo iptables -P INPUT DROP  # ĬÈÏÇéÐÎϾܾøËùÓÐÈëÕ¾Á÷Á¿
$ sudo iptables -P FORWARD DROP  # ĬÈÏÇéÐÎϾܾøËùÓÐת·¢Á÷Á¿
$ sudo iptables -P OUTPUT ACCEPT  # ĬÈÏÇéÐÎÏÂÔÊÐíËùÓгöÕ¾Á÷Á¿

$ sudo iptables -A INPUT -i lo -j ACCEPT  # ÔÊÐíÍâµØ»Ø»·Á÷Á¿
$ sudo iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT  # ÔÊÐíÒѽ¨ÉèµÄÅþÁ¬ºÍÏà¹ØµÄÁ÷Á¿

$ sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT  # ÔÊÐíSSHÅþÁ¬
$ sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT  # ÔÊÐíHTTPÅþÁ¬
$ sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT  # ÔÊÐíHTTPSÅþÁ¬

$ sudo iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT  # ÔÊÐípingÇëÇó

$ sudo iptables -A INPUT -j DROP  # ¾Ü¾øÆäËûËùÓÐÈëÕ¾Á÷Á¿

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$ sudo iptables-save > /etc/iptables/rules.v4  # ÉúÑÄIPv4¹æÔò
$ sudo ip6tables-save > /etc/iptables/rules.v6  # ÉúÑÄIPv6¹æÔò

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$ sudo iptables-restore < /etc/iptables/rules.v4  # ¼ÓÔØIPv4¹æÔò
$ sudo ip6tables-restore < /etc/iptables/rules.v6  # ¼ÓÔØIPv6¹æÔò

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$ sudo setenforce 1  # ÆôÓÃSELinux
$ sudo aa-enforce /path/to/profile  # ÆôÓÃAppArmor

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$ sudo nano /etc/ssh/sshd_config  # ±à¼­SSHÉèÖÃÎļþ

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PermitRootLogin no  # եȡrootÓû§Ö±½ÓµÇ¼
PasswordAuthentication no  # ½ûÓÃÃÜÂëÑéÖ¤
AllowUsers username  # ½öÔÊÐíÌض¨Óû§µÇ¼

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$ sudo apt-get install tcpdump  # ×°ÖÃtcpdump
$ sudo tcpdump -i eth0 -n  # ¼à¿Øeth0½Ó¿ÚµÄÍøÂçÁ÷Á¿

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