# local sysctl settings can be stored in this directory
# max open files
fs.file-max = 512000
# max read buffer
net.core.rmem_max = 7500000
# max write buffer
net.core.wmem_max = 7500000
#net.core.optmem_max = 33554432
# default read buffer
#net.core.rmem_default = 16777216
# default write buffer
#net.core.wmem_default = 16777216
# max processor input queue
net.core.netdev_max_backlog = 8192
# max backlog
net.core.somaxconn = 8192

# resist SYN flood attacks
net.ipv4.tcp_syncookies = 1
# reuse timewait sockets when safe
net.ipv4.tcp_tw_reuse = 1
# turn off fast timewait sockets recycling
#net.ipv4.tcp_tw_recycle = 0
# short FIN timeout
#net.ipv4.tcp_fin_timeout = 40
# increase max orphans
net.ipv4.tcp_max_orphans = 16384
# short keepalive time
#net.ipv4.tcp_keepalive_time = 2400
# outbound port range
net.ipv4.ip_local_port_range = 9999 65000
# max SYN backlog
net.ipv4.tcp_max_syn_backlog = 4096
# max timewait sockets held by system simultaneously
net.ipv4.tcp_max_tw_buckets = 6000
# turn on TCP Fast Open on both client and server side
#net.ipv4.tcp_fastopen = 3
# TCP receive buffer
net.ipv4.tcp_rmem = 4096 87380 16777216
# TCP write buffer
net.ipv4.tcp_wmem = 4096 87380 16777216
# TCP buffer
net.ipv4.tcp_mem = 409600 819200 1638400
# UDP buffer
net.ipv4.udp_mem = 4096 131072 67108864
# turn off path MTU discovery
net.ipv4.tcp_mtu_probing = 0
# 1/8 * available memory in receive buffer
net.ipv4.tcp_adv_win_scale=-3
# limits the size of unsent bytes in the write queue
net.ipv4.tcp_notsent_lowat = 131072

# for low-latency network, use cubic instead
# net.ipv4.tcp_congestion_control = balia

# Default conntrack is too small
net.netfilter.nf_conntrack_max = 131072

net.ipv4.conf.all.ignore_routes_with_linkdown = 1
net.ipv4.conf.default.ignore_routes_with_linkdown = 1

net.ipv4.tcp_ecn = 2
#net.ipv4.tcp_sack = 0
#net.ipv4.tcp_dsack = 0
#net.ipv4.tcp_fack = 0
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.route.gc_timeout = 150