From 2e88e4eaf3e4a23ad65bb3b0c98753a07a166036 Mon Sep 17 00:00:00 2001
From: root <root@fff-ab-01.da-checka.de>
Date: Sat, 18 Nov 2017 21:51:04 +0100
Subject: [PATCH] IP-Forwarding

---
 etc/sysctl.conf                               | 66 +++++++++++++++++++
 .../net/ipv4/icmp_errors_use_inbound_ifaddr   |  0
 proc/sys/net/ipv4/ip_forward                  |  0
 proc/sys/net/ipv6/conf/all/forwarding         |  0
 proc/sys/net/ipv6/conf/default/forwarding     |  0
 5 files changed, 66 insertions(+)
 create mode 100644 etc/sysctl.conf
 create mode 100644 proc/sys/net/ipv4/icmp_errors_use_inbound_ifaddr
 create mode 100644 proc/sys/net/ipv4/ip_forward
 create mode 100644 proc/sys/net/ipv6/conf/all/forwarding
 create mode 100644 proc/sys/net/ipv6/conf/default/forwarding

diff --git a/etc/sysctl.conf b/etc/sysctl.conf
new file mode 100644
index 0000000..9485d8d
--- /dev/null
+++ b/etc/sysctl.conf
@@ -0,0 +1,66 @@
+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additional system variables.
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+##############################################################3
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#
+kernel.panic = 10
+#
+# Sonst landen ICMP-Fehlerpakete auf eth0 - mit source-IP 10.50.x.y...
+# https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt
+net.ipv4.icmp_errors_use_inbound_ifaddr = 1
+
diff --git a/proc/sys/net/ipv4/icmp_errors_use_inbound_ifaddr b/proc/sys/net/ipv4/icmp_errors_use_inbound_ifaddr
new file mode 100644
index 0000000..e69de29
diff --git a/proc/sys/net/ipv4/ip_forward b/proc/sys/net/ipv4/ip_forward
new file mode 100644
index 0000000..e69de29
diff --git a/proc/sys/net/ipv6/conf/all/forwarding b/proc/sys/net/ipv6/conf/all/forwarding
new file mode 100644
index 0000000..e69de29
diff --git a/proc/sys/net/ipv6/conf/default/forwarding b/proc/sys/net/ipv6/conf/default/forwarding
new file mode 100644
index 0000000..e69de29