You can change the port number for telnet using simple IP NAT. Create a loopback on the device you want to change the port on and use this as the NAT inside. Use your LAN interface as the NAT outside and use TCP port translation. e.g R1 telnets to R2 using outside global address 18.104.22.168 port 99
Interface Loop 0
ip address 22.214.171.124 255.255.255.255
ip nat inside
Interface fast 0/0 ;local LAN
ip address 192.168.10.10 255.255.255.0
ip nat outside
ip nat inside source static tcp 126.96.36.199 23 188.8.131.52 99
ensure R2 has a route to R1 and ensure R1 has a route to the inside global address 184.108.40.206 via R2.
From R1 you will be able to telnet via port 99 e.g.
telnet 220.127.116.11 99
Tie down all tcp port 23 traffic via access-lists. Almost a basic IOS firewall in reverse and works with most IOS.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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