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Troubleshooting hi,, recently i have joined in one company as network admin so i want some troubleshooting things, plz hel me out Regards vinay

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  • vinay787 Apr 19, 2008

    I am not able to ping other router of our branch location

    but i can make telnet.... i think ICMP problem, r they

    blocked ICMP....



  • vinay787 Apr 19, 2008


    what are the precaution i have to take

    when router get crash



  • vinay787 Apr 21, 2008


    how to block and unblock icmp

    and i am unable to telnet directly to the router i have to go

    via switch, i mean first i have to telnet and from switch to router

    i think some one block even telnet also... so how to unblock it

    please guide me



  • vinay787 Apr 22, 2008


    We have MPL's connection in all our branches to connect.

    if there is down in MPL's connection, router will trigger isdn line

    automatically. But in some of our branch the router wont trigger

    we have to trigger manually. It is a bit difficult to me because

    in every 1/2 hour i have to ping and check whether the all branches are working or not... Please help me



  • vinay787 Apr 23, 2008


    We have MPL's connection in all our branches to connect.
    if there is down in MPL's connection, router will trigger isdn line
    automatically. But in some of our branch the router wont trigger
    we have to trigger manually. It is a bit difficult to me because
    in every 1/2 hour i have to ping and check whether the all branches are working or not... Please help me


  • Mark Kessler May 11, 2010

    what kind of problems are you experiencing?



2 Answers

Telnet and ICMP can be disabled on specific interfaces by use of Access list commands. You will have to check the router configuration to see if any access list statements exist on the interfaces. They are usually applied to the serial interfaces, which is probably the reason why you could not telnet or ping directly to the router. If there are no access list commands then that means telnet was not configured in the first place.

To disable an access list command, you need to type the entire command with the word 'no' in front of it.

It is not recommended that you disable these features, as it will open your network up to possible attacks. If a hacker were able to telnet to your router and guess the password to login, you could be in for a whole host of problems that you are probably not ready for. Be sure that if you do enable telnet, that you use a very strong password for telnet access.

Posted on Apr 21, 2008

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  • 221 Answers

Telnet is an application layer protocol. If you can telnet to the other router, then you do not have any network issues. However, the fact that you can telnet but not ping suggests that icmp messages have been blocked in the configuration of one or both routers. This is a security feature, because attacks can be launched via icmp messages.

Posted on Apr 19, 2008

  • Mark Kessler Apr 19, 2008

    First thing you need to do is back up the ios which is located in flash memory. You should back up the ios for each router you manage, and name them distinctly so that you know which ios is for which router. You should back up your ios to an external source, such as a server, desktop, or external storage device. You should do this immediately, before a crash should occur.

    If you are using cisco routers, log into the router, then type

    'copy flash tftp'

    you will then be instructed to provide the ip address of the tftp server, along with other information related to the file.

    Another thing, if both routers are the same make and model, one ios version can most likely be used for both.



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