Cisco — How to change telnet port for a Cisco router — not the rotary group solution!

R2#tel 172.16.0.100 23
Trying 172.16.0.100 …
% Connection timed out; remote host not responding

R2#tel 172.16.0.100 9999
Trying 172.16.0.100, 9999 … Open

User Access Verification

Password:
R3>

<..omitted..>
Config on the R3 router:
___________________
ip nat inside source static tcp <desired IP address, ex. the loopback..> 23 <same IP as the previous..> <desired port>
interface <interface for the desired IP>
ip nat outside

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