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WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
第一种方法
。执行echo 511 > /proc/sys/net/core/somaxconn
第二种方法 （永久解决）vi /etc/sysctl.conf
增加
net.ipv4.conf.default.accept_source_route = 1
/etc/sysctl.conf
# System default settings live in /usr/lib/sysctl.d/00-system.conf.
# To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_max_syn_backlog = 8192
net.core.netdev_max_backlog = 8096
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 1