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Configure 3 Cisco Routers 2501,2514

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  • Configure 3 Cisco Routers 2501,2514

    Hey I trying to create a little wan in my home, I`m using 3 routers, 6 computers, 2 switchs. (photo attached).

    When I`m trying to send ping from router #1 to router #2 and back , everything is ok. same is at router #2 to router #3. but when I`m trying to send ping from router #1 to router #3 and back I get this answer: ttl expired in transit.

    any suggestion?




    Shaked.

  • #2
    Re: Configure 3 Cisco Routers 2501,2514

    Hey I succeded to use this netowrk.
    the problem is that my configuration of IGRP are not correct.

    router igrp 1
    net 10.0.0.0
    net 192.168.1.0
    net 192.168.2.0
    net 192.168.3.0

    when I used 192.168.0.0 it doesn't work. but the idea of routing protocol is to send tables to all of the routers, no?

    so I guess my problem is somthing with classes..
    maybe someone have an idea?

    Shaked.

    Comment


    • #3
      Re: Configure 3 Cisco Routers 2501,2514

      Hi Shaked,

      Can you tell me the subnet mask configure for the serial IP's.I will give you the reply shortly.

      Comment


      • #4
        Re: Configure 3 Cisco Routers 2501,2514

        Well , I'm a little rusty on my Cisco but here's my take:

        You don't need to route for the 10.0.0.0 network as that is the network that connects the serial interfaces so each router is directly connected and knows about the 10.0.0.0 network. When your routing is working correctly R1 will know how to find R3 in order for PC1 to ping 10.0.0.6.

        Each router should route for the 192.168.x.0 network that is on it's ethernet interface, not for all three 192.168.x.0 networks. So on R1 the IGRP command should be:

        IGRP 1
        Network 192.168.1.0

        On R2 it should be:

        IGRP 1
        Network 192.168.2.0

        On R3 it should be:

        IGRP 1
        Network 192.168.3.0

        Comment


        • #5
          Re: Configure 3 Cisco Routers 2501,2514

          After thinking about this again it occurs to me that you will still not be able to ping 10.0.0.6 from pc1 because R1 won't know that 10.0.0.6 is on R3. You can't use IGRP to advertise the 10.0.0.0 network because you are using the same subnet mask for the 10.0.0.0 network on each router so each router will think that 10.0.0.0 is local to itself and will only know about the 10.0.0.x address on the adjacent router. If you tried to use IGRP to advertise 10.0.0.0 you would probably create a routing loop as describe below:

          R1 says "10.0.0.0 can be reached through me" and sends this info to R2 who also says "10.0.0.0 can be reached through me" and sends this info to R3 who also says "10.0.0.0 can be reached through me" and sends this info back to R2 and R2 sends it to R1 so each router thinks it can get to 10.0.0.0 through itself and through each neighboring router so any packets destined for a 10.0.0.x address would loop through the routers until the TTL expires, which is why you are getting the TTL expired in transit response from your ping.

          Comment


          • #6
            Re: Configure 3 Cisco Routers 2501,2514

            Hi Shaked ,

            I think the problem is in your Subnet mask because the ip configured in serial interfaces of all the 3 routers belongs to same subnet.Try to change the subnnet in a properway and advertise the network through igrp.I think now it should work fine.

            Comment

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