TCP: How are the seq / ack numbers generated?

Question

I am currently working on a program which sniffs TCP packets being sent and received to and from a particular address. What I am trying to accomplish is replying with custom tai

Answer 1

I have the same job to do. Firstly the initial seq# will be generated randomly(0-4294967297). Then the receiver will count the length of the data it received and send the ACK of seq# + length = x to the sender. The sequence will then be x and the sender will send the data. Similarly the receiver will count the length x + length = y and send the ACK as y and so on... Its how the the seq/ack is generated...

If you want to show it practically try to sniff a packet in Wireshark and follow the TCP stream and see the scenario...