# !! Только для UNIX-систем !!
# это не панацея, набросок со стандартными правилами; заддосить не смогли, зато сайт уронили - 1.3кк обращений в час.
# очищаем правила
/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 2106
/sbin/iptables -I INPUT -p tcp --dport 2106 -j ACCEPT
# закрываем порт гейм сервера 7777
/sbin/iptables -A INPUT -p tcp --dport 7777 -j DROP
###
# прочие разрешения
## коннект к БД, порт 3306
# запрет для всех остальных
/sbin/iptables -I INPUT -p tcp --dport 3306 -j DROP
# разрешить следующим IP
iptables -I INPUT -p tcp -s ВАШ_IP --dport 3306 -j ACCEPT
iptables -I INPUT -p tcp -s IP_САЙТА --dport 3306 -j ACCEPT
iptables -I INPUT -p tcp -s 127.0.0.1 --dport 3306 -j ACCEPT
