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Problem with telnet from outside to inside (Router1841)

rechard_david
Level 1
Level 1

Dear All Expert,

Right now, i had problem with telnet from outside to inside,but i can telnet from inside to router.i don't know what is issue. Please see in the attach file.

1 Accepted Solution

Accepted Solutions

paolo bevilacqua
Hall of Fame
Hall of Fame

Configure:

no access-list 1

access-list 1 permit 192.168.1.1 0.0.0.31

And will be working fine. Remember: never use "any" for NAT ACL.

View solution in original post

7 Replies 7

Rupesh Kashyap
Level 1
Level 1

hi, I am not finding any configuration problem. Do one thing, enable debug ip packet on outside interface and see the telnet traffic.

Dear Rupesh,

Thanks you for your help ...

Could you let me know the command enable debug to see telnet .....?

best Regards,

1. debug ip packet

You can do one think.

Line vty 0 4

access-class 2 in

access-list 2 permit tcp any any eq 23 log

Dear Rupesh,

thanks for your help!!!

this command i tried to used but it still cannot telnet from outside. Oh!! how can we know ISP block ? last time i asked ISP guy and they said no block any thing.... and they don't have firewall ... so how can we make sure our router is ok and ISP has problem.......

Could you advice me how can i do and solve this issue.?

Best Regard

paolo bevilacqua
Hall of Fame
Hall of Fame

Configure:

no access-list 1

access-list 1 permit 192.168.1.1 0.0.0.31

And will be working fine. Remember: never use "any" for NAT ACL.

At first, You have to check, Telnet traffic is reaching to ur Outside interface or not, if initiated from Outside world. Do Debug is the best command to check the Telnet packet. If traffic is not received, then check with ur ISP.

1. Debug ip packet

2. Debug ip packet Detail

3. Debug ip packet interface 2 ( if ACL 2 is applied)

Hi ,

Please remove the “ip nat outside “ from WAN interface and then try to telnet from outside.

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