udp flood attack

0x00 backgroundSYN Flood is one of the most popular DOS (denial of service attacks) and DDoS(distributed denial of service attacks), which is a way of using TCP protocol defects to send a large number of forged TCP connection requests, This allows the attacker to run out of resources (CPU full load or low memory).0x01 CodeThe purpose of this article is to describe how to construct packet using Python.Use the raw socket to send packets. This program is

analysis, it can be basically determined that hackers use the acquired machine to send SYN Flood attack packets containing 970 bytes of Application Data filled with "0" to the fixed host, in addition to the SYNflood attack effect on the server, it also consumes a lot of bandwidth resources at the Internet egress of the attacked host to achieve a comprehensive De

; // 8-bit protocol (TCP, UDP ...)Ip_header.checksum = 0; // 16-bit IP header checksumIp_header.sourceip = inet_addr (fake_ip );Ip_header.destip = inet_addr (syn_dest_ip); // 32-bit destination IP address (attack address) // Fill the TCP HeaderTcp_header.th_sport = htons (src_port); // source port numberTcp_header.th_dport = htons (dest_port); // the destination port number.Tcp_header.th_seq = htonl (sendse

Protect Against SYNSYN attack is the principle of using TCP/IP Protocol 3-time handshake, sending a large number of network packets to establish the connection, but not actualEstablish a connection that eventually causes the network queue of the attacked server to be full and inaccessible to normal users.The Linux kernel provides several SYN-related configurations, with commands:sysctl-a | grep synSee:Net.ipv4.tcp_max_syn_backlog = 1024net.ipv4.tcp_sy

connection in the buffer. At this point, if the legitimate user 61.61.61.61 again to send legitimate data, the server has no such connection, the user must start to establish a new connection. Attack, the attacker will forge a large number of IP address, to send the RST data to the target, so that the server does not serve legitimate users, thereby achieving the victim server denial of service attacks. 3. UDP