server-scripts/sysctl-1G.conf at main · rebelliouswhiz/server-scripts · GitHub

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# SYSTEM SETTINGS
# Control console message logging levels
kernel.printk = 3 4 1 3
# Maximum number of file handles
fs.file-max = 1048576
# Memory management
vm.swappiness = 10
vm.min_free_kbytes = 32768

# CORE NETWORK PARAMETERS
# Connection queue limits
net.core.somaxconn = 4096
net.core.netdev_max_backlog = 8192

# Socket buffer sizes
net.core.rmem_max = 67108864
net.core.wmem_max = 33554432
net.core.rmem_default = 16777216
net.core.wmem_default = 8388608

# Network processing settings
net.core.default_qdisc = fq
net.core.netdev_budget = 1500
net.core.netdev_budget_usecs = 10000

# TCP SETTINGS
# TCP memory limits (min/pressure/max in pages)
net.ipv4.tcp_mem = 65536 131072 262144

# TCP socket buffer sizes (min/default/max in bytes)
net.ipv4.tcp_rmem = 4096 32768 8388608
net.ipv4.tcp_wmem = 4096 32768 8388608

# TCP connection settings
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 20
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_max_tw_buckets = 10000
net.ipv4.tcp_max_orphans = 32768
net.ipv4.ip_local_port_range = 16000 65000

# TCP performance settings
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_abort_on_overflow = 1
net.ipv4.tcp_slow_start_after_idle = 0

# UDP buffer sizes
net.ipv4.udp_rmem_min = 4096
net.ipv4.udp_wmem_min = 4096

# ROUTING AND FORWARDING
# IPv4 forwarding for VPN/proxy functionality
net.ipv4.ip_forward = 1
net.ipv4.icmp_echo_ignore_all = 0

# IPv6 settings
#net.ipv6.conf.all.forwarding = 1
#net.ipv6.conf.default.forwarding = 1
#net.ipv6.conf.all.accept_ra = 2
#net.ipv6.conf.default.accept_ra = 2
#net.ipv6.conf.all.accept_redirects = 0
#net.ipv6.conf.default.accept_redirects = 0
#net.ipv6.conf.all.autoconf = 0
#net.ipv6.conf.default.autoconf = 0
#net.ipv6.conf.all.accept_source_route = 0
#net.ipv6.conf.default.accept_source_route = 0
#net.ipv6.route.max_size = 1048576

# CONNECTION TRACKING
net.netfilter.nf_conntrack_max = 262144
net.netfilter.nf_conntrack_buckets = 65536
net.netfilter.nf_conntrack_tcp_timeout_established = 43200
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 20