Ping issues

Discussion in 'Cisco' started by aiqbal@gbc.com, Mar 24, 2005.

  1. Guest

    Hello,
    I have a 2600 router that I have configured it to be a DHCP server.
    This is what I have so far.

    Diagram
    Router e0/0 192.168.1.100 255.255.255.0
    ======== Hub
    ======== --->==========
    ==========
    | |
    LAptop A Laptop B
    192.168.1.1 192.168.1.2
    255.255.255.0 255.255.255.0



    FYI: this is in a lab enviornment

    router ip address: 192.168.1.100
    Laptop A: 192.168.1.1 SM: 255.255.255.0 GW:192.168.1.100
    Laptop B: 192.168.1.2 SM: 255.255.255.0 GW:192.168.1.100

    Both Laptops are running windows 2000 OS.

    I CAN do the following successfully

    Laptop A can ping the router successfully
    Laptop B can ping the router successfully
    Laptop A can ping itself and 127.0.0.1 successcully
    Laptop B can ping itself and 127.0.0.1 successcully

    PROBLEM is this
    ________________

    Laptop A cannot ping Laptop B
    Laptop B cannot Ping Laptop A
    >From the router I cannot ping Laptop A or B.


    Both laptops and router are on the same subnet.
    ipconfig on both laptop gives me
    IP address
    Subnet mask
    gateway.

    Why cannot I ping Laptop A to B or vice versa and why is the router not
    able to ping either laptops.

    Do I need to put a static routes ? please help

    Thanks in advance for all your help



    Router
    , Mar 24, 2005
    #1
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  2. pkwijibo Guest

    Sounds like you have a firewall on the laptops
    that are blocking ICMP.

    wrote:
    > Hello,
    > I have a 2600 router that I have configured it to be a DHCP server.
    > This is what I have so far.
    >
    > Diagram
    > Router e0/0 192.168.1.100 255.255.255.0
    > ======== Hub
    > ======== --->==========
    > ==========
    > | |
    > LAptop A Laptop B
    > 192.168.1.1 192.168.1.2
    > 255.255.255.0 255.255.255.0
    >
    >
    >
    > FYI: this is in a lab enviornment
    >
    > router ip address: 192.168.1.100
    > Laptop A: 192.168.1.1 SM: 255.255.255.0 GW:192.168.1.100
    > Laptop B: 192.168.1.2 SM: 255.255.255.0 GW:192.168.1.100
    >
    > Both Laptops are running windows 2000 OS.
    >
    > I CAN do the following successfully
    >
    > Laptop A can ping the router successfully
    > Laptop B can ping the router successfully
    > Laptop A can ping itself and 127.0.0.1 successcully
    > Laptop B can ping itself and 127.0.0.1 successcully
    >
    > PROBLEM is this
    > ________________
    >
    > Laptop A cannot ping Laptop B
    > Laptop B cannot Ping Laptop A
    >>From the router I cannot ping Laptop A or B.

    >
    > Both laptops and router are on the same subnet.
    > ipconfig on both laptop gives me
    > IP address
    > Subnet mask
    > gateway.
    >
    > Why cannot I ping Laptop A to B or vice versa and why is the router not
    > able to ping either laptops.
    >
    > Do I need to put a static routes ? please help
    >
    > Thanks in advance for all your help
    >
    >
    >
    > Router
    >
    pkwijibo, Mar 24, 2005
    #2
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  3. Guest

    Yes I do have Checkpoint firewall clients on the laptops. I did disable
    them. does that help?

    Thanks
    , Mar 24, 2005
    #3
  4. pkwijibo Guest

    And it still doesn't work with them disabled?

    wrote:
    > Yes I do have Checkpoint firewall clients on the laptops. I did disable
    > them. does that help?
    >
    > Thanks
    >
    pkwijibo, Mar 24, 2005
    #4
  5. Guest

    That is correct. it still does not work. I am not sure what else I can
    look.
    when I do show run command to see the config
    under memory size it does say
    no ip routing . Is this something that needs to be changed?

    Thanks
    , Mar 24, 2005
    #5
  6. In article <>,
    wrote:

    > That is correct. it still does not work. I am not sure what else I can
    > look.
    > when I do show run command to see the config
    > under memory size it does say
    > no ip routing . Is this something that needs to be changed?


    Yes, but it has nothing to do with the ping problems you're having.
    When you ping from PC A to PC B, the router isn't even involved.

    You need to enable IP routing so that the PCs will be able to access the
    Internet.

    --
    Barry Margolin,
    Arlington, MA
    *** PLEASE post questions in newsgroups, not directly to me ***
    Barry Margolin, Mar 25, 2005
    #6
  7. Mark Lar Guest

    wrote:

    > PROBLEM is this
    > ________________
    >
    > Laptop A cannot ping Laptop B
    > Laptop B cannot Ping Laptop A
    >>From the router I cannot ping Laptop A or B.

    >
    > Both laptops and router are on the same subnet.
    > ipconfig on both laptop gives me
    > IP address
    > Subnet mask
    > gateway.
    >
    > Why cannot I ping Laptop A to B or vice versa and why is the router not
    > able to ping either laptops.

    Check arp caches and traffic on each device, use a sniffer if required,
    double check IP addresses handed out by DHCP, replace the hub.

    M
    Mark Lar, Mar 25, 2005
    #7
  8. John Agosta Guest

    "Mark Lar" <> wrote in message
    news:424493d8$...
    > wrote:
    >
    > > PROBLEM is this
    > > ________________
    > >
    > > Laptop A cannot ping Laptop B
    > > Laptop B cannot Ping Laptop A
    > >>From the router I cannot ping Laptop A or B.

    > >
    > > Both laptops and router are on the same subnet.
    > > ipconfig on both laptop gives me
    > > IP address
    > > Subnet mask
    > > gateway.
    > >
    > > Why cannot I ping Laptop A to B or vice versa and why is the router not
    > > able to ping either laptops.

    > Check arp caches and traffic on each device, use a sniffer if required,
    > double check IP addresses handed out by DHCP, replace the hub.
    >
    > M
    >



    can laptop ping the router?
    yes?
    turn off firewall on laptop
    John Agosta, Mar 26, 2005
    #8
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