Доброе время суток, есть такая проблемка, стоит Cisco 2811. Конфиг упрощен до не возможности.
Нужно из  внутренней сети попасть на на внешнею ip по 2000 порту.
ip пингуеться порт открыт.
2811#telnet ххх.ххх.126.79 2000
Trying ххх.ххх.126.79, 2000 ... Open
но из внутренний сети не заходит

сам конфиг
ip cef
!
!
ip name-server ххх.ххх.64.69
ip name-server ххх.ххх.66.18
ip name-server 192.168.30.1
multilink bundle-name authenticated
!
archive
log config
  hidekeys
!
interface Loopback0
ip address 192.168.10.1 255.255.255.0
ip route-cache policy
ip route-cache flow
!
interface FastEthernet0/0
ip address ххх.ххх.76.18 255.255.255.252
ip nat outside
ip virtual-reassembly
ip route-cache policy
ip route-cache flow
ip policy route-map MAP
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 192.168.30.110 255.255.255.0
ip nat inside
ip virtual-reassembly
ip route-cache policy
ip route-cache flow
duplex auto
speed auto
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 ххх.ххх.76.17
!
ip flow-export version 5
ip flow-export destination 192.168.30.12 9996
!
ip http server
no ip http secure-server
ip nat inside source list 20 interface FastEthernet0/0 overload

!
access-list 20 permit 192.168.30.18
access-list 20 permit 192.168.30.19
access-list 20 permit 192.168.30.16
access-list 20 permit 192.168.30.17
access-list 20 permit 192.168.30.6
access-list 20 permit 192.168.30.7
access-list 20 permit 192.168.30.4
access-list 20 permit 192.168.30.5
access-list 20 permit 192.168.30.2
access-list 20 permit 192.168.30.3
access-list 20 permit 192.168.30.1
access-list 20 permit 192.168.30.14
access-list 20 permit 192.168.30.15
access-list 20 permit 192.168.30.12
access-list 20 permit 192.168.30.13
access-list 20 permit 192.168.30.10
access-list 20 permit 192.168.30.11
access-list 20 permit 192.168.30.8
access-list 20 permit 192.168.30.9
access-list 20 permit 192.168.30.217
access-list 20 permit 192.168.30.170
snmp-server community public RO
snmp-server ifindex persist
snmp-server enable traps tty

Не ругайте сразу, опыта мало )))