Question relating to ESTABLISHED,RELATED rule.

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Hi,

Question relating to ESTABLISHED,RELATED rule.

Obviously at a minimum you need this for the INPUT chain.
It also seems to help a bit with the FORWARDING chain as well.

Is it necessary for the OUTPUT chain?  Will it help problems with e.g.,
sometimes I see blocks when I visit a lot of websites (TCP/port 80) from
banner ads and such, would output help here, or?

This is the rule I am asking about, currently I do not use it and I generally do not see any problems but I am curious how come some people use this and others do not, what are the pros/cons each way?

iptables -I OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

Thanks,

Justin.

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