Optimizing Kernel Parameters IPv4

Optimizing Kernel Parameters IPv4 to support iptables and turn on protection from synflood traffic.
To doing this just do simple step:
1. Go to Terminal
2. #gedit /etc/sysctl.conf
3. Modify /etc/sysctl.conf to optimizing kernel parameters IPv4 :

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 1

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

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

# 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

# Enable logging of packets with malformed IP addresses
net/ipv4/conf/all/log_martians = 1

# Disable redirects
net/ipv4/conf/all/send_redirects = 0

# Disable acceptance of ICMP redirects
net/ipv4/conf/all/accept_redirects = 0

# Turn on protection from Denial of Service (DOS) attacks
net/ipv4/tcp_syncookies = 1

# Disable responding to ping broadcasts
net/ipv4/icmp_echo_ignore_broadcasts = 1

4. Save this configuration to the current file
5. Restart network service, #service network restart
6. Finish ^_^

reference:
echo.or.id, jasakom, eccouncil.org

Notes:
-There are more configuration of Kernel Parameter option for IPv4 at, /proc/sys/net/ipv4/, You can also optimizing at that path ^_^
e.g : #echo "1" > /proc/sys/net/ipv4/ip_forward