iptables udp flood

Some websites are maliciously placed with UDP packet sending tools to attack others, leading to heavy traffic loss. Generally, only the DNS server uses udp protocol, while others can disable UDP packet forwarding.Therefore, a script is written to only allow Outbound UDP packets from the target DNS server. All other

Before the introduction of Linux through the iptables limit UDP contract, this record of Windows 2003 implementation methods. Create a new Bat script, add the following, and then click Run. Copy Code code as follows: : Created by Http://www.jb51.net :D ROP UDP Flood @echo off Cls : Get DNS Address Fo

full-time network administrator who has less than one year of college graduation and has limited practical experience. I am often invited to help. On one occasion, many customers complained that the company's website could not be opened and that they could not view the company's information. They could not see the company's success stories. This seriously affects the communication between the customer and the company, as well as the customer's trust in the company. Diagnosed:

= 262144Net.ipv4.tcp_max_orphans = 262144Net.ipv4.tcp_keepalive_time = 30Iptables Nature Defense:Limit the request speed of SYN (this method needs to adjust a reasonable speed value, otherwise it will affect the normal user's request)Iptables-n Syn-flood (new chain)Iptables-a input-p TCP--syn-j Syn-floodIptables-a syn-flood