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Thread: Cisco Router Troubleshooting #1

  1. #1
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    Default Cisco Router Troubleshooting #1

    An administrator at Techjamaica.com have just finished configuring three routers at two separate offices. The diagram below shows how these routers were connected.

    (MoBay1) ------------- (MoBay2)============(Kingston1)

    ------------ Represents an Ethernet cable
    ========= Represents a Serial cable


    Here are the configurations that were used:
    Code:
    MoBay1's FA0/0:
    IP:   10.10.1.2
    Mask: 255.255.255.0
    
    MoBay2's FA0/0:
    IP:   10.10.1.1
    Mask: 255.255.255.0
    
    MoBay2's S0/0:
    IP:   180.20.1.1
    Mask: 255.255.255.253
    
    Kingston1's S0/0:
    IP:   180.20.1.2
    Mask: 255.255.255.253
    Here's what he can do:
    1. From MoBay2, he can successfully ping MoBay1 and Kingston1
    2. From Kingston1, he can successfully ping Mobay2.

    Here's what he cannot do:
    From Kingston1, he cannot ping MoBay1


    State the possible cause(s) for this problem and solution.
    Last edited by Ropy; Jan 22, 2007 at 08:22 AM.
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  2. #2
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    a proper static route may have not been configured on kingston 1

  3. #3
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    Code:
    MoBay2's S0/0:
    IP:   180.20.1.1
    Mask: 255.255.255.253
    
    Kingston1's S0/0:
    IP:   180.20.1.2
    Mask: 255.255.255.253


    First off there are bad masks on the Serial interfaces for both Kingston1 and Mobay2. Secondly the admin could have failed to put a route to the 10.10.1.0 network pointing to Mobay2.

  4. #4
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    1. Default route not set on Kingston1 OR set to somewhere other than Mobay2
    2. Route to Mobay1 not set on Kingston1
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  5. #5
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    11 months for a first response. Lol, I am no better just seeing this thread. Here's my shot.

    Basically as zRo and others said, I'm going to assume no static routes were configured. Also it seems no routing protocols like RIP for example were configured which would enable Kingston1 to know about Mobay1.

    Before that though as Jack Frost said, the subnet masks are wrong as from what I know so far about classful ip addressing, and subnet masking, 253 in binary would seem as if a network bit was skipped which makes it invalid. I'm not sure of the rules of Variable length subnet masking so that could throw that out the window. I'm not sure.
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  6. #6
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    How exciting/intriguing. Yeah, maybe adjusting the routing policy might do the trick.
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  7. #7
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    firstly,the mask is wrong, so i dont know how yu ping nuhbody. it should be a /30 mask, which is 255.255.255.252

    secondly, you need a static route to and from kingston1 and mobay1

    before the second one, which side is the DCE side?

    Ahhhh, its simple, no dynamic routing protocol has been configured, so neither router has that route, a static route could be used, but thats more work.
    Last edited by ramesh; Dec 31, 2008 at 03:32 PM.
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