How to telnet Cisco router behind an ISP modem from outside network?

tearofstearofs Member Posts: 112
Greetings, I have a 1721 router behind a Verizon modem (Westell). Internet is working fine, I can also telnet to the router from another PC within the network. However, I could NOT telnet to the router from outside network. Please help me out, thank you very much.

This is the config on my 1721:
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R1721
!
enable secret 5 $1$0a/E$ccGKivi8k.ek8mIJxHJZi/
enable password cisco
!
memory-size iomem 25
ip subnet-zero
ip name-server 192.168.1.1
!
!
!
!
interface Ethernet0
ip address dhcp
ip nat outside
full-duplex
!
interface FastEthernet0
ip address 192.168.2.1 255.255.255.0
ip nat inside
speed auto
full-duplex
!
interface Serial0
no ip address
shutdown
!
ip nat inside source list 1 interface Ethernet0 overload
ip classless
no ip http server
!
!
access-list 1 permit 192.168.2.0 0.0.0.255
banner motd ^C

***************************************
Please Login !!!
***************************************
^C
!
line con 0
password XXXXX
logging synchronous
login
line aux 0
line vty 0 4
password XXXXX
logging synchronous
login
!
end

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