Iptables

/sbin/iptables -F
/sbin/iptables -t nat -F
/sbin/iptables -t mangle -F
# other network protection
echo 1 > /proc/sys/net/ipv4/tcp_syncookies                              # enable syn cookies (prevent against the common 'syn flood attack')
echo 0 > /proc/sys/net/ipv4/ip_forward                                  # disable Packet forwarning between interfaces
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts                 # ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast
echo 1 > /proc/sys/net/ipv4/conf/all/log_martians                       # log packets with impossible addresses to kernel log
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses           # disable logging of bogus responses to broadcast frames
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter                          # do source validation by reversed path (Recommended option for single homed hosts)
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects                     # don't send redirects
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route                # don't accept packets with SRR option
# запрещаем все
/sbin/iptables -P INPUT   DROP
/sbin/iptables -P FORWARD DROP
/sbin/iptables -P OUTPUT  DROP
# drop Bad Guys
/sbin/iptables -A INPUT -m recent --rcheck --seconds 60 -m limit --limit 10/second -j DROP
# drop unwanted services
/sbin/iptables -A INPUT -m multiport -p tcp --dports 25,110,111,119,143,465,563,587,993,995 -j DROP
/sbin/iptables -A INPUT -m multiport -p tcp --dports 25,110,111,119,143,465,563,587,993,995 -j DROP
# accept everything from loopback
/sbin/iptables -A INPUT  -i lo -j ACCEPT
/sbin/iptables -A OUTPUT -o lo -j ACCEPT
# disable ping
/sbin/iptables -A INPUT  -p icmp -j DROP
# internet (established and out)
/sbin/iptables -A OUTPUT -o eth0 -j ACCEPT
/sbin/iptables -A INPUT  -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
# открываем порт логина
/sbin/iptables -A INPUT -p tcp --dport 2106 -j ACCEPT
# закрываем порт гейм сервера
/sbin/iptables -A INPUT -p tcp --dport 7777 -j DROP
###
# прочие разрешения
## коннект к БД
# разрешить следующим IP
/sbin/iptables -I INPUT -p tcp -s 95.72.242.107 --dport 3306 -j ACCEPT
/sbin/iptables -I INPUT -p tcp -s 94.142.139.88 --dport 3306 -j ACCEPT
# запрет для всех остальных
/sbin/iptables -A INPUT -p tcp --dport 3306 -j DROP
## коннект к SSH
# разрешить следующим IP
/sbin/iptables -A INPUT -p tcp --dport 22 -s 95.72.242.107 -j ACCEPT
# запрет для всех остальных
/sbin/iptables -A INPUT -p tcp --dport 22 -j DROP

login as: root
root@92.53.104.12's password:
Linux *.*.ru 2.6.27-openvz-chistyakov.1-vps3 #3 SMP Mon Aug 2 18:40:47 MSD 2010 x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Jul 18 03:10:06 2011 from 95.72.242.107
denever:~# cd server/teste
denever:~/server/teste# ./aE.sh
FATAL: Could not load /lib/modules/2.6.27-openvz-chistyakov.1-vps3/modules.dep: No such file or directory
iptables v1.4.2: