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# SYSTEM CONFIGURATION
# ====================
# These are not meant to be modified by the user
#
# To adjust these settings use base_sysctl_config_user dict
#
base_sysctl_config:
# Enable RFC-recommended source validation feature.
net.ipv4.conf.all.rp_filter: 1
net.ipv4.conf.default.rp_filter: 1
# Log packets with impossible addresses to kernel log? yes
net.ipv4.conf.all.log_martians: 1
net.ipv4.conf.default.log_martians: 1
# Reduce the surface on SMURF attacks.
# Make sure to ignore ECHO broadcasts, which are only required in broad network analysis.
net.ipv4.icmp_echo_ignore_broadcasts: 1
# There is no reason to accept bogus error responses from ICMP, so ignore them instead.
net.ipv4.icmp_ignore_bogus_error_responses: 1
# Limit the amount of traffic the system uses for ICMP.
net.ipv4.icmp_ratelimit: 1000
# Send redirects, if router, but this is just server
net.ipv4.conf.all.send_redirects: 0
net.ipv4.conf.default.send_redirects: 0
net.ipv4.conf.all.accept_redirects: 0
net.ipv4.conf.default.accept_redirects: 0
net.ipv6.conf.all.accept_redirects: 0
net.ipv6.conf.default.accept_redirects: 0
net.ipv4.conf.all.secure_redirects: 0
net.ipv4.conf.default.secure_redirects: 0
net.ipv4.conf.all.accept_source_route: 0
net.ipv4.conf.default.accept_source_route: 0
# Protect against wrapping sequence numbers at gigabit speeds
net.ipv4.tcp_timestamps: 0
# Prevent against the common 'syn flood attack'
net.ipv4.tcp_syncookies: 1
# Disable Selective Acknowledgement (SACK)
# Workaround CVE-2019-11477, CVE-2019-11478, CVE-2019-11479
# See https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
net.ipv4.tcp_sack: 0
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