Setting the starting sequence number for a TCP socket

I'm currently involved in testing and I require the ability to set the initial sequence number (ISN) of a TCP connection to a specific value. The ISN is typically a random value chosen by the OS/Network Stack, but I need to have control over it.

Is there a method to achieve this using either C or Python?

Answer №1

  • Get the latest version of lwip and also lwip-contrib.
  • Set up a new tap interface and connect it to your regular network card
  • Compile the
    lwip-contrib/ports/unix/proj/minimal
    application and launch it
  • You should now be able to successfully ping the lwip stack
  • Find TCP sequence numbers in struct tcp_pcb, specifically the values rcv_nxt and snd_nxt
  • Modify the TCP code to prevent these values from being randomized, and establish a TCP connection within the minimal app

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