How to edit a specific byte in a pcap file ?

[Shashank Agarwal <agarwal_shashank () yahoo com>]

Hi,
How can I modify a specific byte using WireShark or any of its tools. I tried bit-twiste, tcprewrite, tcpreplay-edit, 
but to no avail. These tools provide predefined and limited editing capability like editing the IP address or TCP port 
or changing timestamp etc.
E.g. I have the hex bytes from an ethernet broadcast packet -
ff  ff  ff  ff  ff  ff  00  0b  20  40  15  6d  19  02  40 ......
First six bytes is dest. address, next 6 bytes is source address, "19 02" is packet type and the 15th byte (0x40) 
contains a flag. I want to turn on the second bit in this 15th byte. Essentially replacing 0x40 with 0x42.
Which tool can help me with this modification in the pcap file?

Thanks


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