system: Add default sysctl.conf.

diff --git a/etc/sysctl.conf b/etc/sysctl.conf
new file mode 100644 (file)
index 0000000..6cd0aeb
--- /dev/null
+++ b/etc/sysctl.conf
@@ -0,0 +1,67 @@
+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additonal system variables
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 4 4 1 7
+
+##############################################################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
+# This disables TCP Window Scaling (http://lkml.org/lkml/2008/2/5/167),
+# and is not recommended.
+#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
+#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.
+#
+# Ignore ICMP broadcasts
+#net.ipv4.icmp_echo_ignore_broadcasts = 1
+#
+# Ignore bogus ICMP errors
+#net.ipv4.icmp_ignore_bogus_error_responses = 1
+# 
+# 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
+#
+# The contents of /proc/<pid>/maps and smaps files are only visible to 
+# readers that are allowed to ptrace() the process
+# kernel.maps_protect = 1