From 2923fc96ef9ee96a3149c8b2f781402c65e106b9 Mon Sep 17 00:00:00 2001
From: madaidan <50278627+madaidan@users.noreply.github.com>
Date: Mon, 6 May 2019 15:45:53 +0000
Subject: [PATCH] Create tcp_hardening.conf

---
 etc/sysctl.d/tcp_hardening.conf | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 etc/sysctl.d/tcp_hardening.conf

diff --git a/etc/sysctl.d/tcp_hardening.conf b/etc/sysctl.d/tcp_hardening.conf
new file mode 100644
index 0000000..dcc8afb
--- /dev/null
+++ b/etc/sysctl.d/tcp_hardening.conf
@@ -0,0 +1,23 @@
+## TCP/IP stack hardening 
+
+# Protects against time-wait assassination. It drops RST packets for sockets in the time-wait state.
+net.ipv4.tcp_rfc1337=1
+
+# Enables source validation of packets and protects against IP spoofing methods.
+net.ipv4.conf.default.rp_filter=1
+net.ipv4.conf.all.rp_filter=1
+
+# Disables ICMP redirect acceptance.
+net.ipv4.conf.all.accept_redirects=0
+net.ipv4.conf.default.accept_redirects=0
+net.ipv4.conf.all.secure_redirects=0
+net.ipv4.conf.default.secure_redirects=0
+net.ipv6.conf.all.accept_redirects=0
+net.ipv6.conf.default.accept_redirects=0
+
+# Disables ICMP redirect sending.
+net.ipv4.conf.all.send_redirects=0
+net.ipv4.conf.default.send_redirects=0
+
+# Ignores ICMP requests
+net.ipv4.icmp_echo_ignore_all=1