under raw sock we may negotiate size of tcp window size


tcph->window = htonl(65535); //ukuran window indikasi berapa banyak data


as we already know below is the struct of tcp header:


====================

tcph->source = htons(1337);//source port kita 

tcph->seq = random(); //nomor sequence untuk nomor urut dari data pada 
oktet pertama pada segmen tcp

tcph->ack_seq = 0; //ack sequence

tcph->res2 = 0; //reserved kita set 0 

tcph->doff = 0x5; // indikasi data dalam tcp segmen

tcph->syn = 1; //jika syn kita set flag syn =1

// or tcph->flag 

tcph->window = htonl(65535); //ukuran window indikasi berapa banyak data   

tcph->check = 0;//ceksum untuk mengecek integritas segmen tcp

tcph->urg_ptr = 0;//pointer menunjukkan lokasi data yg dianggap urgen   

=====================

 


it's better disable tcp window scaling, u may disable it :



  echo 0 > /proc/sys/net/ipv4/tcp_window_scaling





dont forget to prepare the ip header before prepare the tcp header