Adding port forward rule for new server - Editing config file of a Cisco Router

1) Log into the router with IP address of the router using Putty (SSH). 

2) In command line type in the following:

#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

(config)# ip nat inside source static tcp IP_of_new_server 3389 192.168.1.200 External_RDP_port extendable

(config)#exit

#copy running-config startup-config

destination filename [startup-config] ?          (Hit enter)

To view the config file

#show running-config

press space key to continue

CTL+C to exit