Linux comes with firewall iptables basic use

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Iptables-f Clear All Rules

Iptables-l Show All Rules

Iptables–p setting default Rules

Iptables-a input-j drop inputs and input data are not prompted

Iptables-a input-j REJECT inputs and input data are dropped to prompt for corresponding values or to terminate packet access

Iptables-a input-s localhost-j drop from (localhost) data is dropped (-s specifies the source "hostname/domain name")

Iptables-a input-p TCP--dport 80-j accept data from the TCP protocol 80 destination port all data is released or accepts all data from the TCP protocol 80 destination port

Iptables-a input-i network-j drop from the network all the data that came in from the network

Iptables-a output-p TCP--sport 80-j DROP data from TCP protocol 80 source port all disabled

Iptables-a opuput-o network-j DROP All data from the network is banned

Iptables-i input-s localhost DROP inserts a rule that prohibits localhost

Service iptables Save rules persist

Iptables-save >/etc/sysconfig/iptables Save rules

iptables-d INPUT Delete 1th rule

Iptables-l-N--line-number (-n Display network Listener) (--line-number display line number)

--dport Destination port (service port for localhost)

(Accept all data) (drop suppresses all data and does not prompt) (reject suppresses all data with a hint message)

(-I enters the number of network cards) (-o data card) (--sport Source port) (--dport Target Port)

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Linux comes with firewall iptables basic use