2019-05-06 11:45:53 -04:00
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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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# 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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2019-06-27 14:17:58 -04:00
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# Ignores ICMP requests.
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2019-05-06 11:45:53 -04:00
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net.ipv4.icmp_echo_ignore_all=1
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2019-06-27 14:17:58 -04:00
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# Enables TCP syncookies.
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net.ipv4.tcp_syncookies=1
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# Disable source routing.
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net.ipv4.conf.all.accept_source_route=0
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net.ipv4.conf.default.accept_source_route=0
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