syn flood attack

We often encounter some problems, such as http cc attacks and FTP TCP-FLOOD attacks, as shown in, we can see the continuous anonymous speculative attacks of illegal users. at this time, we have a variety of solutions. You can try to solve this problem by blocking the IP address. Of course, you need to write a shell to determine how many times a user attempts to log on and block it. CC is an attack tool (sof

If you suspect a Dos attack in Linux, you can enter netstat-angrep-I "server IP address: 80 "awk'' {print} 'sortuniq-csort-nnetstat-angrepSYNwc-l this command will automatically count the number of Tcp connections in various states, if SYN_RECV is very high If you suspect a Dos attack in Linux, you can enter Netstat-an grep-I "server IP Address: 80" awk ''{print} 'sort uniq-c sort-n Netstat-an grep "

/http://www.internetsociety.org/doc/amplification-hell-revisiting-network-protocols-ddos-abusehttp://blog.cloudflare.com/technical-details-behind-a-400gbps-ntp-amplification-ddos-attack/http://arstechnica.com/security/2014/01/new-dos-attacks-taking-down-game-sites-deliver-crippling-100-gbps-floods/https://www.us-cert.gov/ncas/alerts/TA14-013A 5. defense against vulnerabilities Summarize the underlying causes of this vulnerability and we will find tha

be used as an NTP server, and the internal time of this server should be used for synchronization; 2. The legendary NTP Reply flood attack, theoretically, 600 UDP packets are returned. I captured the packet and calculated that a packet contains more than 400 bytes. When I captured the packet, it was about 488 bytes (the specific packet size was not fully confirmed ). If there are no network barriers and ne