Thank you Minaezzat,
The first thing we need to do is check for basic connectivity. Are you able to ping the outside interface of your router from a computer outside of your network? If so, then please check your external ip using the following website ipchicken.com.
After confirming basic connectivity, we want to make sure that telnet traffic is reaching the router. This can be done by applying an ACL to the outside interface (vlan799 in your case) using the following configuration:
conf t
!
ip access-list ex TELNETTEST
permit tcp host <ip from ipchicken.com> any eq 23
permit ip any any
int vlan 799
ip access-group TELNETTEST in
After applying the access-list, attempt to connect to the outside interface of your router and check the counters on the ACL. If you have matches, then your telnet traffic is arriving on your router.
If telnet packets are arriving please enable the following debug, try and connect, and send me the output. You will need to enable debug level syslogs in the loggging buffer and increase the buffer size from the default to ensure all of the relevant logs are gathered. You can do this using the following configuration.
conf t
!
logging buffer 100000 7
!
end
debug telnet
Try to connect two or three times and collect the logs (show log) and send me the output.
These steps will allow us to ensure that the packets are arriving at your router and hopefully determine why telnet access is failing.
Thank you for your time,
Matt
