initscripts/etc/sysctl.conf

#
# Kernel sysctl configuration file
#
# /etc/sysctl.conf - Configuration file for setting system variables
# See sysctl(8) and sysctl.conf (5) for more details.

# Enable IP packet forwarding between interfaces (act as a firewall, or router)
#net.ipv4.ip_forward = 1

# Disable ICMP redirect messages
net.ipv4.conf.all.accept_redirects = 0

# Do not accept source routing
net.ipv4.conf.all.accept_source_route = 0

# Log packages that have source addresses with no known route ("martians")
net.ipv4.conf.all.log_martians = 1

# Controls source route verification
net.ipv4.conf.all.rp_filter = 1

# Enable ECN (Explicit Congestion Notification) in TCP connections
net.ipv4.tcp_ecn = 0

# Enable syncookies to hosts when the kernels syn backlog queue is overflowed
net.ipv4.tcp_syncookies = 1

# Ignore ICMP messages sent to broadcast or multicast addresses
net.ipv4.icmp_echo_ignore_broadcasts = 1

# Do not log bogus responses to broadcast frames send by hosts that ignore RFC 1122
#net.ipv4.icmp_ignore_bogus_error_responses = 1

# Controls the System Request debugging functionality of the kernel
# kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

net.ipv4.tcp_window_scaling = 0