sysctl.conf

#
# /etc/sysctl.conf - Configuration file for setting system variables
# See /etc/sysctl.d/ for additional system variables.
# See sysctl.conf (5) for information.
# https://www.kernel.org/doc/html/latest/admin-guide/sysctl/
#

dev.tty.ldisc_autoload = 0
fs.protected_fifos = 2
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
fs.suid_dumpable = 0
kernel.core_uses_pid = 1
kernel.dmesg_restrict = 1
kernel.kptr_restrict = 2
kernel.panic = 60
kernel.panic_on_oops = 60
kernel.perf_event_paranoid = 3
kernel.randomize_va_space = 2
kernel.sysrq = 0
kernel.unprivileged_bpf_disabled = 1
kernel.yama.ptrace_scope = 2
net.core.bpf_jit_harden = 2
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.shared_media = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.secure_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.default.shared_media = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.ip_forward = 0
net.ipv4.tcp_challenge_ack_limit = 2147483647
net.ipv4.tcp_invalid_ratelimit = 500
net.ipv4.tcp_max_syn_backlog = 20480
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv6.conf.all.forwarding = 0
net.ipv6.conf.all.use_tempaddr = 2
net.ipv6.conf.default.accept_ra = 0
net.ipv6.conf.default.accept_ra_defrtr = 0
net.ipv6.conf.default.accept_ra_pinfo = 0
net.ipv6.conf.default.accept_ra_rtr_pref = 0
net.ipv6.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_source_route = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.default.dad_transmits = 0
net.ipv6.conf.default.max_addresses = 1
net.ipv6.conf.default.router_solicitations = 0
net.ipv6.conf.default.use_tempaddr = 2
net.ipv6.conf.eth0.accept_ra_rtr_pref = 0
net.netfilter.nf_conntrack_max = 2000000
net.netfilter.nf_conntrack_tcp_loose = 0