# Defaults are configured in /etc/sysctl.d/* and can be customized in this file


### TUNING NETWORK PERFORMANCE ###
# Increase the maximum number of skb-heads to be cached from 128
# net.core.hot_list_length=256
# increase from 300 to 1024
net.core.netdev_max_backlog=1024

#increase TCP Re-Ordering value in kernel from 3 to 5
net.ipv4.tcp_reordering=5

# Default Socket Receive Buffer
net.core.rmem_default = 262144

# Maximum Socket Receive Buffer
net.core.rmem_max = 4194304

# Default Socket Send Buffer
net.core.wmem_default = 262144

# Maximum Socket Send Buffer
net.core.wmem_max = 4194304

# Increase number of incoming connections
#net.core.somaxconn = 4096

# Increase number of incoming connections backlog
net.core.netdev_max_backlog = 65536


# Protect Against TCP Time-Wait
# From Kernel Source: tcp_rfc1337 - BOOLEAN
#    If set, the TCP stack behaves conforming to RFC1337. If unset,
#    we are not conforming to RFC, but prevent TCP TIME_WAIT
#    assassination.
#    Default: 0
net.ipv4.tcp_rfc1337 = 0

# Increase the maximum total buffer-space allocatable
# This is measured in units of pages (4096 bytes)
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144

# Increase the read-buffer space allocatable
net.ipv4.tcp_rmem = 65535 131072 4194304
net.ipv4.udp_rmem_min = 16384

# Increase the write-buffer-space allocatable
net.ipv4.tcp_wmem = 65535 131072 194304
net.ipv4.udp_wmem_min = 16384

# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
net.ipv4.tcp_max_tw_buckets = 1440000
#net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15

# Decrease the time default value for tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 15

net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_mtu_probing=1

net.ipv4.tcp_timestamps=0
net.ipv4.tcp_sack=0
net.ipv4.tcp_low_latency=1

vm.swappiness = 0