Can Ping, but cannot Telnet

Answered Question
Aug 16th, 2010

Hi,

I have recently configured a cisco 2811 router for the client.It is CME and is having a a VPN connection to a remote office. All the thing which I configured is working perfectly.

The fast ethernet 0/0 is with a Public IP. I can ping this IP from outside networks, but I cant telnet it. I have attached the config of the same router.Appreciate your commets on this.

Faizal

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Correct Answer by Paolo Bevilacqua about 6 years 5 months ago

In ACL nat-acl change:

permit ip any any

to:

permit ip 10.132.1.0 0.0.0.255 any


Note: you do no need vpnd configuration for pppoe client.

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Jennifer Halim Tue, 08/17/2010 - 01:17

Base on the configuration, I don't see a reason why telnet would not work from the Internet. Where are you trying to telnet from? Could it be firewall that might be blocking telnet traffic?

Correct Answer
Paolo Bevilacqua Tue, 08/17/2010 - 02:40

In ACL nat-acl change:

permit ip any any

to:

permit ip 10.132.1.0 0.0.0.255 any


Note: you do no need vpnd configuration for pppoe client.

canakweze Tue, 08/17/2010 - 03:44

faizal_vi,


I dont see anywhere you defined access list pointing to the public ip address you are trying to telnet from. I do suggest you use http://whatismyipaddress.com/ to find out your public ip address. In that case you only allow access to a specific ip address instead of all traffic. for example if your public ip address is 68.205.201.70, you will just need to add the following to your config file.

access-list 2 permit 68.205.201.70

line vty 0 4
access-class 2 in

line vty 5 15
access-class 2 in

Hope this works for you

Paolo Bevilacqua Tue, 08/17/2010 - 13:28

No, the problem is tjat you cannot use ip any any in NAT ACL, as I have explained above.

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