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Create tcp_hardening.conf
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etc/sysctl.d/tcp_hardening.conf
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etc/sysctl.d/tcp_hardening.conf
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## TCP/IP stack hardening
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# Protects against time-wait assassination. It drops RST packets for sockets in the time-wait state.
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net.ipv4.tcp_rfc1337=1
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# Enables source validation of packets and protects against IP spoofing methods.
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net.ipv4.conf.default.rp_filter=1
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net.ipv4.conf.all.rp_filter=1
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# Disables ICMP redirect acceptance.
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net.ipv4.conf.all.accept_redirects=0
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net.ipv4.conf.default.accept_redirects=0
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net.ipv4.conf.all.secure_redirects=0
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net.ipv4.conf.default.secure_redirects=0
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net.ipv6.conf.all.accept_redirects=0
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net.ipv6.conf.default.accept_redirects=0
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# Disables ICMP redirect sending.
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net.ipv4.conf.all.send_redirects=0
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net.ipv4.conf.default.send_redirects=0
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# Ignores ICMP requests
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net.ipv4.icmp_echo_ignore_all=1
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