DDOS时需要改的一些参数

echo    2    >    /proc/sys/net/ipv4/synack_retries
echo    3    >    /proc/sys/net/ipv4/tcp_fin_timeout
echo    8000    >    /proc/sys/net/ipv4/tcp_max_syn_backlog
echo    2    >    /proc/sys/net/ipv4/tcp_syn_retries
echo    2    >    /proc/sys/net/ipv4/tcp_synack_retries
echo    1    >    /proc/sys/net/ipv4/tcp_syncookies
echo    1    >    /proc/sys/net/ipv4/tcp_tw_recycle
echo    1    >    /proc/sys/net/ipv4/tcp_tw_reuse
echo    1    >    /proc/sys/net/ipv4/tcp_window_scaling