===== Example ======
<code>
  ip nat inside source static tcp 172.16.1.1 22 192.168.1.100 22 extendable
</code>

===== Debug =====
<code>
show ip nat translations

debug ip nat detailed
! Don't forget to term mon
term mon
</code>
===== Pres port mapy=====
<code>
ip access-list extended PortForward-ACL
permit udp host [PrivateIP] any eq 53
permit tcp host [PrivateIP] any range 80 81
!
route-map PortForward-RM permit 10
match ip address PortForward-ACL
!
ip nat inside source static [PrivateIP] [PublicIP] route-map PortForward-RM
</code>
Links:
  * http://ping8888.com/2014/01/21/cisco-ios-port-forwarding-pat/
  * http://network-chef.blogspot.cz/2013/05/performing-nat-port-forwarding-on-cisco.html