gistfile1.txt

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additonal system variables
# See sysctl.conf (5) for information.
#

#kernel.domainname = example.com

# Uncomment the following to stop low-level messages on console
#kernel.printk = 3 4 1 3

##############################################################3
# Functions previously found in netbase
#

# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
# Turn on Source Address Verification in all interfaces to
# prevent some spoofing attacks
#net.ipv4.conf.default.rp_filter=1
#net.ipv4.conf.all.rp_filter=1

# Uncomment the next line to enable TCP/IP SYN cookies
# See http://lwn.net/Articles/277146/
# Note: This may impact IPv6 TCP sessions too
#net.ipv4.tcp_syncookies=1

# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host
#net.ipv6.conf.all.forwarding=1


###################################################################
# Additional settings - these settings can improve the network
# security of the host and prevent against some network attacks
# including spoofing attacks and man in the middle attacks through
# redirection. Some network environments, however, require that these
# settings are disabled so review and enable them as needed.
#
# Do not accept ICMP redirects (prevent MITM attacks)
#net.ipv4.conf.all.accept_redirects = 0
#net.ipv6.conf.all.accept_redirects = 0
# _or_
# Accept ICMP redirects only for gateways listed in our default
# gateway list (enabled by default)
# net.ipv4.conf.all.secure_redirects = 1
#
# Do not send ICMP redirects (we are not a router)
#net.ipv4.conf.all.send_redirects = 0
#
# Do not accept IP source route packets (we are not a router)
#net.ipv4.conf.all.accept_source_route = 0
#net.ipv6.conf.all.accept_source_route = 0
#
# Log Martian Packets
#net.ipv4.conf.all.log_martians = 1
#

# This line blow add by user.

# increase TCP max buffer size settable using setsockopt()
net.core.rmem_max = 67108864 
net.core.wmem_max = 67108864 

# increase Linux autotuning TCP buffer limit
net.ipv4.tcp_rmem = 4096 87380 67108864
net.ipv4.tcp_wmem = 4096 65536 67108864

# increase the length of the processor input queue
net.core.netdev_max_backlog = 250000

# recommended for hosts with jumbo frames enabled
net.ipv4.tcp_mtu_probing = 1

#使用hybla拥塞控制
net.ipv4.tcp_congestion_control = hybla

net.ipv4.tcp_syncookies = 1
# 表示开启 SYN Cookies。当出现 SYN 等待队列溢出时，启用 cookies 来处理，可防范少量 SYN 攻击，默认为 0，表示关闭；

net.ipv4.tcp_tw_reuse = 1
# 表示开启重用。允许将 TIME-WAIT sockets 重新用于新的 TCP 连接，默认为 0，表示关闭；

net.ipv4.tcp_tw_recycle = 0
# 此功能和Android系统冲突，必须禁用。

net.ipv4.tcp_fin_timeout = 30
# 修改系統默认的 TIMEOUT 时间。

net.ipv4.tcp_keepalive_time = 1200
# 表示当 keepalive 起用的时候，TCP 发送 keepalive 消息的频度。缺省是 2 小时，改为 20 分钟。

net.ipv4.tcp_max_syn_backlog = 8192
# 表示 SYN 队列的长度，默认为 1024，加大队列长度为 8192，可以容纳更多等待连接的网络连接数。