>Вам , смотрите что в iptables. IPtables:
# Generated by iptables-save v1.3.8 on Wed May 12 16:42:20 2010
*raw
:PREROUTING ACCEPT [121822690:76232346187]
:OUTPUT ACCEPT [12359244:8144377425]
COMMIT
# Completed on Wed May 12 16:42:20 2010
# Generated by iptables-save v1.3.8 on Wed May 12 16:42:20 2010
*nat
:PREROUTING ACCEPT [1723575:115308130]
:POSTROUTING ACCEPT [366762:21646585]
:OUTPUT ACCEPT [259722:17363597]
-A PREROUTING -d ***.***.***.*** -i eth1 -p tcp -m tcp --dport 3389 -j DNAT --to-d estination 192.168.201.100:3389
-A POSTROUTING -s 192.168.201.0/255.255.255.0 -o eth1 -j MASQUERADE
COMMIT
# Completed on Wed May 12 16:42:20 2010
# Generated by iptables-save v1.3.8 on Wed May 12 16:42:20 2010
*mangle
:PREROUTING ACCEPT [121822690:76232346187]
:INPUT ACCEPT [11935089:6042371108]
:FORWARD ACCEPT [109883113:70189601599]
:OUTPUT ACCEPT [12359246:8144377753]
:POSTROUTING ACCEPT [122239051:78333769825]
COMMIT
# Completed on Wed May 12 16:42:20 2010
# Generated by iptables-save v1.3.8 on Wed May 12 16:42:20 2010
*filter
:INPUT DROP [587:198852]
:FORWARD DROP [3308:213959]
:OUTPUT ACCEPT [6204081:5950252458]
:DMZIN - [0:0]
:DMZOUT - [0:0]
:INETIN - [0:0]
:INETOUT - [0:0]
:LDROP - [0:0]
:LREJECTLTREJECT - [0:0]
:TCPACCEPT - [0:0]
:TREJECT - [0:0]
:UDPACCEPT - [0:0]
:ULDROP - [0:0]
:ULREJECT - [0:0]
:ULTREJECT - [0:0]
-A INPUT -i eth1 -j INETIN
-A INPUT -s 192.168.201.0/255.255.255.0 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A FORWARD -s 192.168.201.10 -o eth1 -p tcp -m tcp --sport 3389 -j ACCEPT
-A FORWARD -d 192.168.201.10 -i eth1 -p tcp -m tcp --dport 3389 -j ACCEPT
-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
-A FORWARD -i eth1 -o eth0 -j INETIN
-A FORWARD -i eth0 -o eth1 -j INETOUT
-A FORWARD -s 192.168.201.0/255.255.255.0 -i ! eth1 -o ! eth1 -j ACCEPT
-A OUTPUT -o eth1 -j INETOUT
-A INETIN -m state --state INVALID -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 5 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 9 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 10 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 15 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 16 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 17 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 18 -j TREJECT
-A INETIN -p icmp -m icmp --icmp-type 8 -m limit --limit 1/sec -j ACCEPT
-A INETIN -p icmp -m icmp --icmp-type 8 -j TREJECT
-A INETIN -p icmp -m icmp ! --icmp-type 8 -j ACCEPT
-A INETIN -p tcp -m tcp --dport 25 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 47 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 80 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 21 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 22 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 110 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 1723 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 143 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 3389 -j TCPACCEPT
-A INETIN -p tcp -m tcp --dport 1490 -j TCPACCEPT
-A INETIN -p udp -m udp --dport 47 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 68 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 6112 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 6119 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 4000 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 1490 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 1723 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 500 -j UDPACCEPT
-A INETIN -p udp -m udp --dport 143 -j UDPACCEPT
-A INETIN -m state --state ESTABLISHED -j ACCEPT
-A INETIN -p tcp -m tcp --dport 1024:65535 -m state --state RELATED -j TCPACCEPT
-A INETIN -p udp -m udp --dport 1024:65535 -m state --state RELATED -j UDPACCEPT
-A INETIN -j TREJECT
-A INETOUT -j ACCEPT
-A LDROP -p tcp -m limit --limit 2/sec -j LOG --log-prefix "TCP Dropped " --log- level 6
-A LDROP -p udp -m limit --limit 2/sec -j LOG --log-prefix "UDP Dropped " --log- level 6
-A LDROP -p icmp -m limit --limit 2/sec -j LOG --log-prefix "ICMP Dropped " --lo g-level 6
-A LDROP -f -m limit --limit 2/sec -j LOG --log-prefix "FRAGMENT Dropped "
-A LDROP -j DROP
-A TCPACCEPT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 20/s ec -j ACCEPT
-A TCPACCEPT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 2/se c -j LOG --log-prefix "Possible SynFlood "
-A TCPACCEPT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j TREJECT
-A TCPACCEPT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -j ACCEPT
-A TCPACCEPT -m limit --limit 2/sec -j LOG --log-prefix "Mismatch in TCPACCEPT "
-A TCPACCEPT -j TREJECT
-A TREJECT -p tcp -j REJECT --reject-with tcp-reset
-A TREJECT -p udp -j REJECT --reject-with icmp-port-unreachable
-A TREJECT -p icmp -j DROP
-A TREJECT -j REJECT --reject-with icmp-port-unreachable
-A UDPACCEPT -p udp -j ACCEPT
-A UDPACCEPT -m limit --limit 2/sec -j LOG --log-prefix "Mismatch on UDPACCEPT "
-A UDPACCEPT -j TREJECT
-A ULDROP -p tcp -m limit --limit 2/sec -j ULOG --ulog-prefix "LDROP_TCP"
-A ULDROP -p udp -m limit --limit 2/sec -j ULOG --ulog-prefix "LDROP_UDP"
-A ULDROP -p icmp -m limit --limit 2/sec -j ULOG --ulog-prefix "LDROP_ICMP"
-A ULDROP -f -m limit --limit 2/sec -j ULOG --ulog-prefix "LDROP_FRAG"
-A ULDROP -j DROP
-A ULREJECT -p tcp -m limit --limit 2/sec -j ULOG --ulog-prefix "LREJECT_TCP"
-A ULREJECT -p udp -m limit --limit 2/sec -j ULOG --ulog-prefix "LREJECT_UDP"
-A ULREJECT -p icmp -m limit --limit 2/sec -j ULOG --ulog-prefix "LREJECT_UDP"
-A ULREJECT -f -m limit --limit 2/sec -j ULOG --ulog-prefix "LREJECT_FRAG"
-A ULREJECT -j REJECT --reject-with icmp-port-unreachable
-A ULTREJECT -p tcp -m limit --limit 2/sec -j ULOG --ulog-prefix "LTREJECT_TCP"
-A ULTREJECT -p udp -m limit --limit 2/sec -j ULOG --ulog-prefix "LTREJECT_UDP"
-A ULTREJECT -p icmp -m limit --limit 2/sec -j ULOG --ulog-prefix "LTREJECT_ICMP "
-A ULTREJECT -f -m limit --limit 2/sec -j ULOG --ulog-prefix "LTREJECT_FRAG"
-A ULTREJECT -p tcp -j REJECT --reject-with tcp-reset
-A ULTREJECT -p udp -j REJECT --reject-with icmp-port-unreachable
-A ULTREJECT -p icmp -j DROP
-A ULTREJECT -j REJECT --reject-with icmp-port-unreachable
COMMIT
# Completed on Wed May 12 16:42:20 2010
