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...YN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. possible SYN flooding on port 3306. Sending cookies. I adapted already following: # sysctl -a |grep -E 'maxconn|syn_backlog' net.core.somaxconn = 2048 net.ipv4.tcp_max_syn_backlog = 2048 but ListenOverflows and ListenDrops values are still high # cat /proc/net/netstat | awk '{print $21 "-" $22 }' ListenOverflows-ListenDrops 13568-13568 any suggestion? -- Thanks, LF

...;> possible SYN flooding on port 3306. Sending cookies. >> >> >> I adapted already following: >> >> # sysctl -a |grep -E 'maxconn|syn_backlog' >> net.core.somaxconn = 2048 >> net.ipv4.tcp_max_syn_backlog = 2048 >> >> >> but ListenOverflows and ListenDrops values are still high >> >> # cat /proc/net/netstat | awk '{print $21 "-" $22 }' >> ListenOverflows-ListenDrops >> 13568-13568 >> >> any suggestion? > > Use tools like tcpdump/wireshark and further examination of logf...

...e SYN flooding on port 3306. Sending cookies. > possible SYN flooding on port 3306. Sending cookies. > > > I adapted already following: > > # sysctl -a |grep -E 'maxconn|syn_backlog' > net.core.somaxconn = 2048 > net.ipv4.tcp_max_syn_backlog = 2048 > > > but ListenOverflows and ListenDrops values are still high > > # cat /proc/net/netstat | awk '{print $21 "-" $22 }' > ListenOverflows-ListenDrops > 13568-13568 > > any suggestion? Use tools like tcpdump/wireshark? and further examination of logfiles to determine where your attac...