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## Can do it in ip_queue_xmit()

  Forum: Network Buffers And Memory Management
  Re: Changing IP packets destined for a gateway (Ian Carr-de Avelon)
  Keywords: IP Packets routeing
  Date: Mon, 02 Feb 1998 13:29:48 GMT
  From: Ritvik Pandey <ritvikp@iitk.ernet.in>

If the packets, with which you want play with, come from the same host whose kernel you will be changing, then you can easily do it in ip_queue_xmi(). This function is called by tcp_send_skb().