Resend TCP segment modified to the sender

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Hi guys,
    I have a problem. I have a client (192.168.9.2) that send TCP segment to a server (192.168.11.2). Between this PC there is a Linux router that captures all the segment and do forwarding. I want that it takes a client packet (the 10th TCP data packet sended, for example), modify it as i want, and then resend it to the client with ipq_set_verdict.
Is this operation possible? Or netfilter can only send the modified packet at the server? If it's possible, which field must i modify to do this (i've tried to modify some flag but it doesn't work)?
 
Thanks for your help
Best regards
 
 

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