>При том, что внешний мой ip - 122.188.122.188, а ip шлюза у
>моего провайдера - 122.188.122.189 и eth0 смотрит внутрь, а eth1 наружу.
Этот скрипт должен помочь.....
================================================================
#!/bin/bash
case "$1" in
start)
echo "Start IP-Paketfilter"
modprobe ip_tables
modprobe ip_conntrack
modprobe ip_conntrack_irc
modprobe ip_conntrack_ftp
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP
iptables -N MY_REJECT
iptables -A MY_REJECT -p tcp -m limit --limit 7200/h -j LOG --log-prefix "REJECT TCP "
iptables -A MY_REJECT -p tcp -j REJECT --reject-with tcp-reset
iptables -A MY_REJECT -p udp -m limit --limit 7200/h -j LOG --log-prefix "REJECT UDP "
iptables -A MY_REJECT -p udp -j REJECT --reject-with icmp-port-unreachable
iptables -A MY_REJECT -p icmp -m limit --limit 7200/h -j LOG --log-prefix "DROP ICMP "
iptables -A MY_REJECT -p icmp -j DROP
iptables -A MY_REJECT -m limit --limit 7200/h -j LOG --log-prefix "REJECT OTHER "
iptables -A MY_REJECT -j REJECT --reject-with icmp-proto-unreachable
iptables -N MY_DROP
iptables -A MY_DROP -m limit --limit 7200/h -j LOG --log-prefix "PORTSCAN DROP "
iptables -A MY_DROP -j DROP
iptables -A INPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "INPUT INVALID "
iptables -A OUTPUT -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "OUTPUT INVALID "
iptables -A FORWARD -m state --state INVALID -m limit --limit 7200/h -j LOG --log-prefix "FORWARD INVALID "
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags ALL NONE -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags SYN,FIN SYN,FIN -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN,RST -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags FIN,RST FIN,RST -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags FIN,RST FIN,RST -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags ACK,FIN FIN -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags ACK,FIN FIN -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags ACK,PSH PSH -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags ACK,PSH PSH -j MY_DROP
iptables -A INPUT -p tcp --tcp-flags ACK,URG URG -j MY_DROP
iptables -A FORWARD -p tcp --tcp-flags ACK,URG URG -j MY_DROP
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
iptables -A OUTPUT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i ! eth1 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# HTTP
iptables -A INPUT -i eth1 -m state --state NEW -p tcp --dport 80 -j ACCEPT
# HTTPS
iptables -A INPUT -i eth1 -m state --state NEW -p tcp --dport 443 -j ACCEPT
# DNS
iptables -A INPUT -i eth1 -m state --state NEW -p tcp --dport 53 -j ACCEPT
iptables -A INPUT -i eth1 -m state --state NEW -p udp --dport 53 -j ACCEPT
iptables -A INPUT -m state --state NEW -i eth0 -j ACCEPT
iptables -A INPUT -j MY_REJECT
iptables -A OUTPUT -j MY_REJECT
iptables -A FORWARD -j MY_REJECT
echo 1 > /proc/sys/net/ipv4/ip_forward 2> /dev/null
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/tcp_syncookies 2> /dev/null
for i in /proc/sys/net/ipv4/conf/*; do echo 0 > $i/accept_source_route 2> /dev/null; done
for i in /proc/sys/net/ipv4/conf/*; do echo 0 > $i/accept_redirects 2> /dev/null; done
for i in /proc/sys/net/ipv4/conf/*; do echo 2 > $i/rp_filter 2> /dev/null; done
for i in /proc/sys/net/ipv4/conf/*; do echo 1 > $i/log_martians 2> /dev/null; done
for i in /proc/sys/net/ipv4/conf/*; do echo 0 > $i/bootp_relay 2> /dev/null; done
for i in /proc/sys/net/ipv4/conf/*; do echo 0 > $i/proxy_arp 2> /dev/null; done
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses 2> /dev/null
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts 2> /dev/null
echo 5 > /proc/sys/net/ipv4/icmp_ratelimit
echo 262144 > /proc/sys/net/ipv4/ipfrag_high_thresh
echo 196608 > /proc/sys/net/ipv4/ipfrag_low_thresh
echo 30 > /proc/sys/net/ipv4/ipfrag_time
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
echo 3 > /proc/sys/net/ipv4/tcp_retries1
echo 15 > /proc/sys/net/ipv4/tcp_retries2
;;
stop)
echo "Stop IP-Paketfilter"
# Tabelle flushen
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X
echo "Deaktiviere IP-Routing"
echo 0 > /proc/sys/net/ipv4/ip_forward
# Default-Policies setzen
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
;;
status)
echo "Tabelle filter"
iptables -L -vn
echo "Tabelle nat"
iptables -t nat -L -vn
echo "Tabelle mangle"
iptables -t mangle -L -vn
;;
*)
echo "Ошибка"
echo "Syntax: $0 {start|stop|status}"
exit 1
;;
esac
======================================================================
Вариант для распечатки
OpenNET: Виртуальная конференция (Public)
(ok) on
15-Окт-04, 23:55 (MSK)
