# Security hardening — applied automatically by 40-sysctl.sh
# Network: anti-spoofing
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
# Network: SYN flood protection
net.ipv4.tcp_syncookies = 1
# Network: ICMP hardening
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.conf.all.log_martians = 1
# Network: IPv6 hardening
net.ipv6.conf.all.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0
net.ipv6.conf.all.accept_ra = 0
# Network: source routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
# Kernel: information disclosure
kernel.kptr_restrict = 2
kernel.dmesg_restrict = 1
kernel.perf_event_paranoid = 3
# Kernel: core dump safety
fs.suid_dumpable = 0