struct pseudo_tcph *ps_tcph = (struct pseudo_tcph *)((char*)tcp - sizeof(struct pseudo_tcph));
            ps_tcph->ip_src = inet_addr(addr);
            ps_tcph->ip_dst = inet_addr(scanned_computer);
            ps_tcph->zero = 0;//always zero
            ps_tcph->protocol = 6;// = 6;//for tcp
            ps_tcph->tcp_len = htons(sizeof(struct tcphdr));
            //ps_tcph->tcp = tcp;
            /*******************************************************************
             * Title: rawtcp.c
             * Date: 20.4.2019
             * Code version:
             * Availability: https://www.tenouk.com/Module43a.html
            ********************************************************************/
                tcp->th_sport = htons(my_beautiful_port);
                tcp->th_dport = htons(i);
                tcp->th_seq = htonl(1);
                tcp->th_ack = 0;
                //tcp->th_offx2 = 5;
                tcp->th_ack = 0;
                tcp->th_win = htons(32767);
                tcp->th_sum = 0; // here NOT Done by kernel --> pseudo header for this reason
                tcp->th_urp = 0;
                tcp->th_flags = TH_SYN;

                din.sin_port = htons(i);

        //      iph->ip_sum = csum((unsigned short *)buffer,
//                              (sizeof(struct ip) + sizeof(struct tcphdr)));
                tcp->th_sum = csum((unsigned short *)ps_tcph, sizeof(struct pseudo_tcph) + sizeof(struct tcphdr));
                iph->ip_sum = csum((unsigned short *)buffer, iph->ip_len >> 1);
        // IP structure
        iph->ip_hl = 5;
        iph->ip_v = 4;
        iph->ip_tos = 16;
        iph->ip_len = sizeof(struct ip) + sizeof(struct tcphdr);
        iph->ip_id = htonl(54321);
        iph->ip_off = 0;
        iph->ip_ttl = 64;
        iph->ip_p = 6; // TCP
        iph->ip_sum = 0; // Done by kernel
        // Source IP, modify as needed, spoofed, we accept through command line argument
        iph->ip_src.s_addr = inet_addr(addr);
        // Destination IP, modify as needed, but here we accept through command line argument
        iph->ip_dst.s_addr = inet_addr(scanned_computer);
        iph->ip_len = sizeof(struct ip) + sizeof(struct tcphdr);

                // Inform the kernel do not fill up the headers' structure, we fabricated our own
                if(setsockopt(sendfd, IPPROTO_IP, IP_HDRINCL, val, sizeof(one)) < 0)