Cannot ping from Cisco Router

Posted on 2004-11-04
Last Modified: 2010-04-17
I am pretty sure I have this setup correctly.  Basically I have a Cisco 2600 router.  I have one WIC (fastethernet0/0)
I have the router connected to my laptop via console cable and network cable.  The laptop is setup with and IP of subnet
I just want to make sure the router can communicate through the WIC to the laptop.  I set the fastethernet interface on the router to with sam subnet.
There is no other machine using this ip.....shouldn't I be able to ping the laptop now?
The router can ping itself fine and my interface is set for up/up.... there is a no shut on it also...
hmmmm... any ideas
Question by:angelasasse
    LVL 50

    Expert Comment

    by:Don Johnston
    Are you using a crossover cable between the PC and the router?

    If you are connecting the PC directly to the router, you will need a crossover cable.


    Author Comment

    I have tried a crossover cable from the laptop to the router and also from the switch to the router.
    LVL 2

    Expert Comment

    The cable should be a rollover cable for Cisco equipment. See for a description of these cables. Basically, pin 1 goes to pin 8, pin 2 goes to pin 7, and so on. They're Cisco-proprietary, and you might have recieved one with your router. Mine are almost always a flat, light-blue cable.
    LVL 2

    Expert Comment

    Sorry, I misunderstood. The rollover cable connects a computer to the console port, but you're concerned about the WAN port. In that case, try turning on ip packet debugging (debug ip packet) and see if the ping arrives on the router or not.
    LVL 79

    Expert Comment

    WIC does not equal FastEthernet. The only FastEthernet interface is on the main board, with yellow label
    WIC= Wan Interface Card like a T1DSU or serial interface. Has two screws, fits in slot above the Ethernet/Console/aux ports..

    Ethernet crossover required for direct connect between laptop and router
    Standard patch cable required between router and switch, and between switch and laptop


    Author Comment

    I didn't mean to say WIC.  .... I am plugging the cable into the FasEthernet port.  When I use a crossover direct from the laptop I still cannot get communication.
    LVL 5

    Expert Comment

    >I have the router connected to my laptop via console cable and network cable.

    Connect only to the fastethernet port.  Go to a command prompt and check your routing table (route print).  You should see either a default gateway pointing to the router's interface or you are in broadcast mode and your gateway and IP are the same.  Either way, you should be able to ping the router's interface.  If not, do arp -a and check your arp table.  If you don't see the cisco connected, you have a connectivity problem at (most likely) layer 1.  If you do see it there, you have a network problem (layer 3).  In which case you either have a firewall or access list on one of the ports that is dropping the ICMP traffic.

    For connection to the console port you need a rollover cable.  But if you're using a hyperterm session at the same time as trying to ping, your traffic may be going through the serial port of the laptop instead of the NIC--never tried it, so I'm not sure.
    LVL 2

    Accepted Solution

    Here are some basic thoughts -

    1st things 1st, lets make sure that you are linking up properly:  Are you connecting via a direct point-to-point cable or are you traversing a switch / hub?  If so, what kind of switch/hub  - have you tried other ports?  Is this switch a "managed" switch where you can go in to its CLI and see what settings are set on the interfaces - if so, are any set with restrictions to MAC addresses or ACL's, etc.?

    From the cisco cli, perform a "show int fast0/0".  Take a look -  Make sure that it is up / up and that it doesn't say "spoofing"...  Can you copy and paste the "interface FastEthernet0/0" settings from a "show run" so that we can see?  Perhaps there is a ACL on the interface not allowing ICMP in/out that we can ID.

    From your laptop - do you see the link lights on the Ethernet Adapter?  Another way is to go in to properties of the adapter and see what speed the adapter is linked up at - are you connecting at the same speed and duplex as your router?  Are you able to ping your laptop from your laptop?  From your laptop - go to DOS, type "IPCONFIG /ALL" - are your IP settings as expected?

    Are you running XPSP2?  And if so, are you trying to ping the laptop from the router?  (If you are answering yes / yes then try pinging the router from the laptop - XPSP2 has a built in firewall and you cannot ping it - ICMP is probably blocked.

    Are you able to use something else to connect to the routers fastethernet 0/0 like a PC or another laptop/PC?

    Expert Comment

    I have a similiar setup.  I have a 2620XM with a Serial 0/0 CSU/DSU T-1 card, Fast Ethernet 0/0, and I recently added a NM-4E which is a 4 port Ethernet Network module.  E1/0,E1/1,E1/2,E1/3.

    Can you post a running config type:
    show running-config
    make sure to XXX out any reference to our IP assigned by your ISP for security purposes.  

    If your using Windows XP SP2 by default the Firewall is turned on.  If you go into the control panel on the laptop and choose Windows Firewall on the first tab choose off then click apply.  This will turn off your firewall.  

    I have also noticed when troublshooting a similar issue that the computer needs to reboot while the static IP is set.  

    Have you tried the simple fix?  It might be just a bad cable. Replace it.  

    Are you getting link lights on both ends?  Are you using a store bought crossover cable or just a cable you created?  Might be a good idea to go pick up one.


    Author Comment

    I would just like to thank everyone a bunch for all the help...
    You guys are AWESOME!!

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