net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.ip_local_port_range = 1024 65000

net.ipv4.route.max_size = 4096000
net.core.somaxconn = 8192
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.netfilter.ip_conntrack_max = 2621400
net.core.rmem_max = 20000000

ulimit -n 40960
ulimit -c unlimited

做個記號，有待增補完全。