Здравствуйте.

есть Debian 503. ядро - 2.6.26-2-686 в роли маршрутизатора, две сетевых карты.
подсеть 192.168.0.0/24 Windows 7
провайдер ТТК
проблема: некоторые пакеты из локальной сети идут в обход NAT
Прошу вас помочь решить данную проблему!

пример лога с комутатора провайдера:
Ethernet channel ETH 4 blocked, reason - wrong source IP (192.168.0.2 instead 94.251.38.193)

.......Firewall....

###########################################################################
#
# 1. Configuration options.
#

#
# 1.1 Internet Configuration.
#
INET_IP="94.251.38.193"
INET_IFACE="eth0"
#
# 1.1.1 DHCP
#
# 1.2 Local Area Network configuration.
#
# your LAN's IP range and localhost IP. /24 means to only use the first 24
# bits of the 32 bit IP adress. the same as netmask 255.255.255.0
#

LAN_IP="192.168.0.1"
LAN_IP_RANGE="192.168.0.0/24"
LAN_BCAST_ADRESS="192.168.0.255"
LAN_IFACE="eth1"

#
# 1.3 DMZ Configuration.
#
# 1.4 Localhost Configuration.
#
LO_IFACE="lo"
LO_IP="127.0.0.1"
#
# 1.5 IPTables Configuration.
#
IPTABLES="/sbin/iptables"
#
# 1.6 Other Configuration.
#
#2. Module loading.
#
# Needed to initially load modules
#
/sbin/depmod -a
#
# 2.1 Required modules
#
/sbin/modprobe ip_tables
/sbin/modprobe ip_conntrack
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_limit
/sbin/modprobe ipt_state
/sbin/modprobe ipt_TTL
#
# 2.2 Non-Required modules
#
/sbin/modprobe ip_conntrack_ftp
#
# 3. /proc set up.
#
# 3.1 Required proc configuration
#
echo "1" > /proc/sys/net/ipv4/ip_forward
#
# 4. rules set up.
# 4.1 Filter table
#
# 4.1.1 Set policies
#
$IPTABLES -F
$IPTABLES -F -t nat
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP
#
# 4.1.2 Create userspecified chains
#
# Create chain for bad tcp packets
#
$IPTABLES -N bad_tcp_packets
#
# Create separate chains for ICMP, TCP and UDP to traverse
#
$IPTABLES -N allowed
$IPTABLES -N icmp_packets
$IPTABLES -N tcp_packets
$IPTABLES -N udpincoming_packets
#
# 4.1.3 Create content in userspecified chains
#
# bad_tcp_packets chain
#
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "New not syn:"
$IPTABLES -A bad_tcp_packets -p tcp ! --syn -m state --state NEW -j DROP
#
# allowed chain
#
$IPTABLES -A allowed -p TCP --syn -j ACCEPT
$IPTABLES -A allowed -p TCP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A allowed -p TCP -j DROP
#
# TCP rules
#
#  80  HTTP
$IPTABLES -A tcp_packets -s 0/0 -p TCP --dport 80 -j allowed
#
#
# 22, 80, 25, 110
$IPTABLES -A tcp_packets -s $LAN_IP_RANGE -p TCP --dport 22 -j allowed
$IPTABLES -A tcp_packets -s $LAN_IP_RANGE -p TCP --dport 80 -j allowed
$IPTABLES -A tcp_packets -s $LAN_IP_RANGE -p TCP --dport 25 -j allowed
$IPTABLES -A tcp_packets -s $LAN_IP_RANGE -p TCP --dport 110 -j allowed
#
# MY HOME
#
$IPTABLES -A tcp_packets -p TCP -s 94.251.36.63 --dport 3389 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 94.251.36.63 --dport 22 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 94.251.36.63 --dport 1494 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 194.150.155.214 --dport 3389 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 194.150.155.214 --dport 22 -j allowed
$IPTABLES -A tcp_packets -p TCP -s 194.150.155.214 --dport 1494 -j allowed
#
##p2p
#
$IPTABLES -A udpincoming_packets -p UDP -s 0/0 --destination-port 68 -j ACCEPT
$IPTABLES -A FORWARD -d $LAN_IP_RANGE -p udp --dport 30002 -j ACCEPT
$IPTABLES -A FORWARD -d $LAN_IP_RANGE -p tcp --dport 30001 -j ACCEPT
#
# ICMP rules
#
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 80 -j ACCEPT
$IPTABLES -A icmp_packets -p ICMP -s 0/0 --icmp-type 11 -j ACCEPT
#
# 4.1.4 INPUT chain
#
# Bad TCP packets we don't want.
#
$IPTABLES -A INPUT -p tcp -j bad_tcp_packets
#
# Rules for special networks not part of the Internet
#
$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -s $LAN_IP_RANGE -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LO_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $LAN_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LO_IFACE -s $INET_IP -j ACCEPT
$IPTABLES -A INPUT -p ALL -i $LAN_IFACE -d $LAN_BCAST_ADRESS -j ACCEPT
#
# Rules for incoming packets from the internet.
#
$IPTABLES -A INPUT -p ALL -d $INET_IP -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -p TCP -i $INET_IFACE -j tcp_packets
$IPTABLES -A INPUT -p UDP -i $INET_IFACE -j udpincoming_packets
$IPTABLES -A INPUT -p ICMP -i $INET_IFACE -j icmp_packets
#
# Log weird packets that don't match the above.
#
$IPTABLES -A INPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT INPUT packet died: "
#
# 4.1.5 FORWARD chain
#
# Bad TCP packets we don't want
#
$IPTABLES -A FORWARD -p tcp -j bad_tcp_packets
#
# Accept the packets we actually want to forward
#
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
#
#    DROP
#
#$IPTABLES -A FORWARD -s $LAN_IP_RANGE -d 89.250.252.0/16 -j DROP
#$IPTABLES -A FORWARD -s $LAN_IP_RANGE -d 78.24.9.0/16 -j DROP
#
#  INTERNET
#
# nat
$IPTABLES -A FORWARD -s 192.168.0.2 -d 0/0 -j ACCEPT

# INCOMMING CONNECTION
#
$IPTABLES -A FORWARD -s 94.251.36.63 -d $LAN_IP_RANGE -j ACCEPT
$IPTABLES -A FORWARD -s 194.150.155.214 -d $LAN_IP_RANGE -j ACCEPT

# Log weird packets that don't match the above.
#
$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT FORWARD packet died: "
#
# 4.1.6 OUTPUT chain

# Bad TCP packets we don't want.
#
$IPTABLES -A OUTPUT -p tcp -j bad_tcp_packets
#
# Special OUTPUT rules to decide which IP's to allow.
#
$IPTABLES -A OUTPUT -p ALL -s $LO_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $LAN_IP -j ACCEPT
$IPTABLES -A OUTPUT -p ALL -s $INET_IP -j ACCEPT
#
# Log weird packets that don't match the above.
#
$IPTABLES -A OUTPUT -m limit --limit 3/minute --limit-burst 3 -j LOG --log-level DEBUG --log-prefix "IPT OUTPUT packet died: "
#
# 4.2 nat table

# REMOTE DESKTOP

# MY HOME
#
$IPTABLES -t nat -A PREROUTING -p tcp -s 94.251.36.63 --dport 3389 -j DNAT --to-destination 192.168.0.2:3389
$IPTABLES -t nat -A PREROUTING -p tcp -s 194.150.155.214 --dport 3389 -j DNAT --to-destination 192.168.0.2:3389
#
#P2P
#
$IPTABLES -t nat -A PREROUTING -p tcp -d 94.251.38.193 --dport 30001 -j DNAT --to-destination 192.168.0.2:30001
$IPTABLES -t nat -A PREROUTING -p udp -d 94.251.38.193 --dport 30002 -j DNAT --to-destination 192.168.0.2:30002

#
# 4.2.5 POSTROUTING chain
#

$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j SNAT --to-source $INET_IP