how to customize TCP Hand shake for HTTP
 

I am very new to linux , i would like to know how to customize TCP hand shake for my HTTP server . please help me where i have to do modification in linux to performe the same.

Exactly what do you mean by 'customize TCP Hand shake'?

TCP does three way hand shaking , in which i need to avoid/change/modify packet header of my reply packet to my client who is requesting HTTP service to my webserver

I really don't think you should do that, but please explain your problem with details.

why dont i do this....it is my need i would like to avoid few typical attacks like DOS so that i am doing it

That won't prevent DOS attacks...

And most likely will break TCP entirely.

If you want an isolated network, just disconnect from the internet.

Dear all how to it works or make it work is my research please help me in customizing tch handshake .please help on this

I really don't think you should do that, but please explain your problem with details.

The TCP stack is implemented in the kernel so you'll have to modify that. Some reading to get you going:
http://www.ece.virginia.edu/cheetah/...s/TCPlinux.pdf
http://www.cubrid.org/blog/dev-platf...network-stack/
http://lxr.free-electrons.com/source/net/ipv4/tcp.c

Thank you SoftSprocket , i will try and come back