tool for creating packets

[Juan B <juanbabi () yahoo com>]

Hi,

For testing a server im looking for a tool,doesnt
metter if it is win or linux based which help me to
create tcp and udp packets with m own payload. where 
can I fond such a tool ? or should I use a scripting
language such as perl in order to do that?

also I look for a tool which created raw sucket
between a client and a server.

thanks for the help.

Juan

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