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ssh-keygen -t rsa -b 4096

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ssh-copy-id Óû§Ãû@IPµØµã

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sudo vi /etc/ssh/sshd_config

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sudo systemctl restart sshd

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sudo apt-get install iptables

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sudo touch /etc/iptables.rules
sudo vi /etc/iptables.rules

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*filter
# ĬÈÏÕ½ÂÔ
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]

# ÔÊÐíÍâµØ»Ø»·½Ó¿ÚµÄ»á¼û
-A INPUT -i lo -j ACCEPT

# ÔÊÐíÒѾ­½¨ÉèµÄ¡¢Ïà¹ØµÄÅþÁ¬½øÈë
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# ÔÊÐíSSHÅþÁ¬
-A INPUT -p tcp --dport 22 -j ACCEPT

# ÔÊÐíÆäËûÐëÒªµÄ¶Ë¿Ú
# -A INPUT -p tcp --dport 80 -j ACCEPT
# -A INPUT -p tcp --dport 443 -j ACCEPT

# ÔÊÐíICMP (Ping)ÇëÇó
-A INPUT -p icmp --icmp-type echo-request -j ACCEPT

# ÔÊÐíÏÞÖƵÄIPµØµã¹æÄ£
-A INPUT -s ÔÊÐíÅþÁ¬µÄIPµØµã/×ÓÍøÑÚÂë -j ACCEPT

# ÔÊÐíij¸öIPµØµã¹æÄ£µÄ»á¼û
# -A INPUT -s ÔÊÐíÅþÁ¬µÄIPµØµã/×ÓÍøÑÚÂë -j ACCEPT

# ¾Ü¾øËùÓÐÆäËûÈëÕ¾Á÷Á¿
-A INPUT -j DROP

COMMIT

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sudo iptables-restore < /etc/iptables.rules
sudo touch /etc/network/if-pre-up.d/iptables
sudo chmod +x /etc/network/if-pre-up.d/iptables
sudo vi /etc/network/if-pre-up.d/iptables

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#!/bin/sh
/sbin/iptables-restore < /etc/iptables.rules

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sudo reboot

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sudo tail -f /var/log/syslog

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sudo tail -f /var/log/auth.log

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sudo apt-get install nethogs
sudo nethogs

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sudo apt-get install htop
sudo htop

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