Doubts on TCP sockets in linux

Lonnie Olson fungus at
Fri Nov 11 10:35:11 MST 2005

On Nov 10, 2005, at 9:43 PM, hari kumar wrote:
>           I have few doubts on Linux TCP socket.My doubt goes like
> this..I have formed TCP Socket between two host. Now I want to know
> the TCP flag and state details at socket level.I wanted to do some
> encapsulation based upon the flag set. It would be great if anyone can
> help me on this.

I am assuming you are programming TCP sockets.

Uh, the socket level is a layer above the the TCP level.

TCP is at layer 4 (Transport Layer).  Sockets are at layer 5 (Session  

If you want to use sockets, all the TCP stuff is abstracted away from  
your control.  The sockets library contains the code to communicate  
to the TCP layer.  This means your code is at the Presentation or  
Application layer.  In order to communicate with the TCP layer you  
will need to skip the sockets libraries and speak directly to the TCP  
layer itself.

Now if my assumption is wrong, and you just want to watch the traffic  
flowing, you can use ethereal, tcpdump, etc.  They all have fairly  
good documentation.


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