[Nfsen-discuss] fliter with interface IN or OUT traffic ??

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Dear All :

How can i filter with interface IN or OUT traffic ?

i use filter .... src or dst  net x.x.x.x/24 but it is no good if i have 
many network sagement,
i know filter syntax ... IF NUM ... but i don't know how to define IN or 
OUT traffic ??

someone can help me, thank you very much

ps: my english is poor, i hope you can understand