extract or manipulate packets at POST ROUTING

YongHan Lee y_h_lee at yahoo.com
Thu Aug 25 18:39:14 CEST 2005

I create a TCP packet and pass to kernel space (LOCAL
OUT). After routing at POST-ROUTING I send it back to
user space. 
How can I extract informations (the result of the
kernel routing) from the packet and maybe manipulate
some packet information. Is it possible?

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