sudo vi /etc/fstab

tmpfs     /dev/shm     tmpfs     defaults,noexec,nosuid     0     0

sudo vi /etc/sysctl.conf

# IP Spoofing protection
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1

# Ignore ICMP broadcast requests
net.ipv4.icmp_echo_ignore_broadcasts = 1

# Disable source packet routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv6.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0

# Ignore send redirects
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0

# Block SYN attacks
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 5

# Log Martians
net.ipv4.conf.all.log_martians = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1

# Ignore ICMP redirects
net.ipv4.conf.all.accept_redirects = 0
net.ipv6.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv6.conf.default.accept_redirects = 0

# Ignore Directed pings
net.ipv4.icmp_echo_ignore_all = 1

sudo sysctl -p

sudo vi /etc/host.conf

order bind,hosts
nospoof on

sudo vi /etc/php5/apache2/php.ini

disable_functions = exec,system,shell_exec,passthru
register_globals = Off
expose_php = Off
magic_quotes_gpc = On

sudo apt-get install denyhosts

sudo vi /etc/denyhosts.conf

ADMIN_EMAIL = root@localhost
SMTP_HOST = localhost
SMTP_PORT = 25
#SMTP_USERNAME=foo
#SMTP_PASSWORD=bar
SMTP_FROM = DenyHosts nobody@localhost
#SYSLOG_REPORT=YES

sudo apt-get install fail2ban

sudo vi /etc/fail2ban/jail.conf

[ssh]

enabled  = true
port     = ssh
filter   = sshd
logpath  = /var/log/auth.log
maxretry = 3

destemail = root@localhost

action = %(action_)s

action = %(action_mwl)s

sudo vi /etc/fail2ban/jail.local

sudo /etc/init.d/fail2ban restart

sudo fail2ban-client status

sudo apt-get install rkhunter chkrootkit

sudo chkrootkit

sudo rkhunter --update
sudo rkhunter --propupd
sudo rkhunter --check

sudo apt-get install nmap

nmap -v -sT localhost

sudo nmap -v -sS localhost

sudo apt-get install logwatch libdate-manip-perl

sudo logwatch | less

sudo logwatch --mailto mail@domain.com --output mail --format html --range 'between -7 days and today'

sudo apt-get install tiger

sudo tiger

sudo less /var/log/tiger/security.report.*

**My heartiest best wishes to you. good luck.**