how to ensure reliable in raw protokol

[nagaedan]

i new in socket programming
and i try to learn raw protokol

and i have study about covert channel by crowland
http://www.firstmonday.org/issues/issue2_5/rowland/

i have modified program only using IP ID
and use compression algorithm

i have no idea that program reliable or not

so i have been thinking like this :

|--------syn IPID-----> |
| |
| <----resp ------------- |
| |
|-------> loss |
| timeout |
|------>resend-------->|
|<---------resp----------|
|---------syn IPID----->|
| <---Loss--------|
|time out |
|--->resend----------->| because ipid have accepted i try to ignored and
|<--------resp-----------| send respond


and after i try i have failed, and i have no idea any more

because
send_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)
after sendto(send_socket, &send_tcp, 40, (struct sockaddr *)&sin, sizeof(sin));
i write
read(send_socket, (struct recv_tcp *)&recv_pkt, 9999);
to listen respond,

and it just listen even if there is incoming paket


please help me