question about iptables

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Hi, everybody

Itables man tells me that 
table filter includes INPUT, FORWARD, OUTPUT chains
table nat includes PREROUTING, OUTPUT, POSTROUTING chains
table mangle includes PREROUTING and POSTROUTING chains

It seems that they are overlaping
Might anybody tell me the difference such as that between nat and mangle?

Thanx in advance

Xing Fei


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