Modifying TCP header (Just for Fun) lazarus / 38-Networking and Web Programming ---------------------------------------------------------------------- BSaidus · 2017-04-19 10:46 Hello.! I wonder if there is a possibility to modify a TCP Header, so to modify the source IP address. Is there any library ready to do that ... Thanks. ---------------------------------------------------------------------- marcov · 2017-04-19 11:35 Not modify, but pcap running under sufficient permissions might allow you to write raw packets onto an interface.