any recommendation?

yiminggong

I am looking for a software that can be used to rewrite the content of a
pcap file, for example, changing all the destination ip address from
x.x.x.x to y.y.y.y, 
rewriting all source port from xx to yy. I have
googled a while but got no result, also a tool named tcprewrite had been
tried but it does not do the job quite well, so I turn to this
discussion group,
I don't know if there is a speical 'plugin' of ethereal that can do
this, or any another software recommended?

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