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I am working on a project where I need to test whether TCP reliability is in action or not. For example I want to check something like this 1)I have a client which makes a request for a resource say using HTTP 2)Initially all the TCP 3 Way Hand shake would happen and a GET request would be placed. 3)The server would respond with appropriate response.

I am trying to tweak the contents from the Server side (I am taking care of the TCP stack). In such a case I want to test if the server is sendign the packet reliably or not. For eg:I want to simulate an environment where the Client doesnt ACK for the TCP Payload it recieeved hence forcing the server to resend the data after sometime.

Any tools to do test something like this ? Thanks in advance

Satwik Krishna
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  • The server won't notice this at all, it's handled internally within the stack. – Barmar Aug 21 '14 at 01:50
  • You can use tcpdump or Wireshark to see the retransmissions. – Barmar Aug 21 '14 at 01:51
  • Hi The problem I am facing is the client immediately acks the receieved data(the TCP stack on client side) and thus the TCP stack on the server doesnt have a chance to retransmit the data.Is there any way I can test this ? Or do I assume the TCP stack would take care of this.We are kind of playing with the TCP streams so thought it was better to check this functionality – Satwik Krishna Aug 21 '14 at 17:24
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    Unless you're writing your own TCP stack, you should just assume that the existing TCP stack will take care of this -- that's what everyone in the world does. If you are creating your own stack, google **tcp stack tester** and you'll find some utilities. – Barmar Aug 21 '14 at 17:34
  • Thanks so much. I am not creating my own TCP stack but I am inserting packets onto the stack by altering packets which I receive(Something like Deep Packet Inspection and altering the payload) – Satwik Krishna Aug 21 '14 at 18:04
  • In that case, you might indeed want to make use of one of those tools, since you're effectively modifying the stack. – Barmar Aug 21 '14 at 18:06

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