Netgraph node to replace packet contents?

[Norberto Meijome]

hi all,
is there any already existing  Netgraph node that would allow me to replace bytes in the data part of a packet?  I'm talking about generic "foo" for "BAR" replacement, though different lengths  would be good too.

or maybe other tool can do this too? 

thanks!
B
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{Beto|Norberto|Numard} Meijome

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