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I found this rules on iptables

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

what is the meaning of -m state --state RELATED,ESTABLISHED ?

and why without this rule I can not ping www.google.cn ?

thank you very much ^_^

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At it's most basic; it allows traffic in Both directions if you first request something. You probably can't Ping because the State isn't allowing any return data.

See: User-land states

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