tcp ip syn

kernel: TCP: request_sock_TCP: Possible SYN flooding on port 4096. Sending cookies.  Check SNMP counters.

SYN cookies

• https://cr.yp.to/syncookies.html

这个写的不错

• https://wenfh2020.com/2022/01/22/kernel-tcp-socket-backlog/

看看 redhat 的分析

https://access.redhat.com/solutions/30453

https://serverfault.com/questions/294209/possible-syn-flooding-in-log-despite-low-number-of-syn-recv-connections

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