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This article introduces the knowledge of "how to add iptables firewall rules to linux". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Iptables Settin

The copy code is as follows:

* filter

: input drop [0:0]

: forward accept [0:0]

: output accept [49061:9992130]

If an input-I lo-j accept is not enabled, many services will be unavailable. Enable the loopback address.

-an input-p icmp-j accept allows icmp packets to pass, that is, to allow others to ping themselves

-an input-m state-- state related,established-j accept

-an input-p tcp-m tcp-- dport 21-j accept

-an input-p tcp-m tcp-- dport 25-j accept

-an input-p tcp-m tcp-- dport 80-j accept

-an input-p tcp-m tcp-- dport 110j accept

-an input-p tcp-m tcp-- dport 8080-j accept

-an input-p tcp-m tcp-- dport 10337-j accept this is my own ssh connection port

-an input-j reject--reject-with icmp-host-prohibited

Commit

Note: when using, remove the Chinese comment after the rule, and it can also be written in multi-port mode.

The copy code is as follows:

-an input-p tcp-m multiport-- dports 21, 25, 80, 110, 3306, 8080, 10337-j accept

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