[疑難排除] 請教...請教

请问以下这些是什么咚咚? 用来做什么?
1.ipchains and masquerading
2.ipfiltering
3.rules on packet filtering
got any website or guidline is related about this 3?

http://www.tvbnow.com/viewthread.php?tid=151598&extra=page%3D1
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