linux firewall命令

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Linux Firewall

Linux is known for its robust firewall capabilities. A firewall is an essential part of any security strategy. It is a network security system that monitors and controls incoming and outgoing traffic based on predefined security protocols.

Iptables

linux firewall命令

Iptables is a user-space utility program that allows a system administrator to configure the tables used by the Linux kernel firewall. It is the most popular firewall tool used on Linux systems. With iptables, you have control over the flow of traffic into and out of your system.

UFW

UFW is a simplified frontend for iptables that allows you to configure firewall rules for your Ubuntu system. It is a user-friendly firewall application that makes it easier for beginners to configure firewall rules.

Nftables

Nftables is a new and modern firewall utility that has replaced the old iptables tools. It provides better performance, scalability, and ease of use than iptables. It comes with a new syntax and a more flexible rule language.

Basic iptables Commands

iptables -L: This command lists all current rules in the iptables firewall.

iptables -A INPUT -p tcp --destination-port 80 -j ACCEPT: This command adds a rule to allow incoming TCP traffic on port 80.

iptables -A INPUT -p tcp --destination-port 22 -j DROP: This command adds a rule to block all incoming SSH traffic.

iptables -A OUTPUT -d 192.168.0.1 -j DROP: This command blocks all outgoing traffic to the IP address 192.168.0.1.

iptables -F: This command flushes all the rules in the iptables firewall.

UFW Commands

ufw enable: This command enables the UFW firewall.

ufw disable: This command disables the UFW firewall.

ufw allow ssh: This command allows incoming SSH traffic.

ufw deny smtp: This command blocks outgoing SMTP traffic.

ufw status verbose: This command shows the current status of the UFW firewall.

Nftables Commands

nft list ruleset: This command lists all current rules in the nftables firewall.

nft add rule filter input tcp dport 80 accept: This command adds a rule to allow incoming TCP traffic on port 80.

nft add rule filter input tcp dport 22 drop: This command adds a rule to block all incoming SSH traffic.

nft add rule filter output ip daddr 192.168.0.1 drop: This command blocks all outgoing traffic to the IP address 192.168.0.1.

nft flush ruleset: This command flushes all the rules in the nftables firewall.

Conclusion

In conclusion, firewalls are essential for protecting your Linux system from malicious attacks. Knowing how to configure and manage firewalls is an essential skill for any system administrator. By understanding the basic commands for iptables, UFW, and nftables, you can better protect your Linux system from security threats.

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