Well-tuned sysctl.conf configuration file

sysctl.conf Configuration parameters:
Net.ipv4.ip_forward = 0
Net.ipv4.conf.default.rp_filter = 1
Net.ipv4.conf.default.accept_source_route = 0
KERNEL.SYSRQ = 0
Kernel.core_uses_pid = 1
Net.ipv4.tcp_syncookies = 1
KERNEL.MSGMNB = 65536
Kernel.msgmax = 65536
Kernel.shmmax = 68719476736
Kernel.shmall = 4294967296
Net.ipv4.tcp_max_tw_buckets = 6000
Net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
Net.ipv4.tcp_wmem = 8192 4336600 873200
Net.ipv4.tcp_rmem = 32768 4336600 873200
Net.core.wmem_default = 8388608
Net.core.rmem_default = 8388608
Net.core.rmem_max = 16777216
Net.core.wmem_max = 16777216
Net.core.netdev_max_backlog = 262144
Net.core.somaxconn = 262144
Net.ipv4.tcp_max_orphans = 3276800
Net.ipv4.tcp_max_syn_backlog = 262144
Net.ipv4.tcp_timestamps = 1
Net.ipv4.tcp_synack_retries = 1
Net.ipv4.tcp_syn_retries = 1
Net.ipv4.tcp_tw_recycle = 1
Net.ipv4.tcp_tw_reuse = 1
Net.ipv4.tcp_mem = 786432 1048576 1572864
Net.ipv4.tcp_fin_timeout = 30
#net. Ipv4.tcp_keepalive_time = 30
Net.ipv4.tcp_keepalive_time = 300
Net.ipv4.ip_local_port_range = 1024 65000

Use Sysctl-p to make it effective, students who need to try.