IPv6 Troubleshooting

Scenario:

Your colleague Henry Exadecimal has been busy upgrading the network to IPv6 to replace the old IPv4 topology. Some of the routers have been configured for RIPNG, OSPFv3 and even some tunneling over IPv4. Unfortunately Henry isn’t very good at IPv6 and the network is one big mess. You have been studying CCNP ROUTE for quite some time so you are very familiar with IPv6…it’s up to you to fix this!

Goal:

  • All IP addresses have been preconfigured for you.
  • Do not use show run! (this will spoil the fun πŸ™‚ use the appropiate ‘show’ and ‘debug’ commands. This will teach you the skills needed to become a true troubleshooting master.
  • R1 is supposed to receive an IPv6 prefix from R2 through autoconfiguration but for some reason this is not working.
  • R1 should have an IPv6 default route in its routing table. You are not allowed to create a default route yourself or configure a routing protocol on R1.
  • R3 should be able to reach the loopback0 interface of R2 but this is not working.
  • R3 and R4 are configured for OSPFv3 but for some reason no neighbor adjacency is appearing.
  • R2 should be able to reach the loopback0 interface of R4 and vice versa, however this is not working as expected.
  • R4 and R5 are configured for OSPFv3 on the frame-relay link. The neighbor adjacency is not working however…
  • R5 and R7 are configured for IPv6 6to4 tunneling because R6 is an IPv4-only device. For some reason the tunnel is not working.
  • When you are finished, R2,R3,R4,R5 and R7 should be able to ping each others loopback0 interfaces.

It took me 1000s of hours reading books and doing labs, making mistakes over and over again until I mastered all the troubleshooting issues for CCNP.

Would you like to be a master of troubleshooting too? In a short time without having to read 900 page books or google the answers to your questions and browsing through forums?

I collected all my knowledge and created a single ebook for you that has everything you need to know to become a master of troubleshooting.

You will learn all the secrets about IPv6 troubleshooting and more.

Does this sound interesting to you? Take a look here and let me show you how to Master CCNP TSHOOT

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

IPv6 Troubleshooting

Configuration Files

You need to register to download the GNS3 topology file. (Registration is free!)

Once you are logged in you will find the configuration files right here.

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The How to Master series helps you to understand complex topics like spanning-tree, VLANs, trunks, OSPF, EIGRP, BGP and more.

Written by RenΓ© Molenaar - CCIE #41726

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About the Author: Rene Molenaar

RenΓ© - CCIE #41726 is the creator of GNS3Vault.com where he shares CCNA, CCNP and CCIE R&S labs. He also blogs about networking on http://networklessons.com

28 Comments

  1. Rene this one sais that I need to register to download the files and I think I’m already registered xP. Thanks by the way! you’re awesome!

      1. Rene could you please make a video solution for this lab. I can’t seem to figure out how to make default route without static or dynamic routing

  2. Does the debug output "Mar 1 00:28:48.803: RIPng: Suppressed null multicast update on FastEthernet0/0 for RIPNG"

    have anything to do with why R3 cannot ping L0 on R2? I am stumped by that.

  3. Hi Rene.
    Thank you for your labs.
    I am wondering if you can give me a hint about a default route on the Router R1. After searching the Internet for a solution still no luck.
    Thank you for you attention.

  4. Hi Rene this one says I must register to download the files and I’m already registered, please help

  5. enter your message here…[quote=rdm1860]Does the debug output "Mar 1 00:28:48.803: RIPng: Suppressed null multicast update on FastEthernet0/0 for RIPNG"

    have anything to do with why R3 cannot ping L0 on R2? I am stumped by that.[/quote]

  6. The tunnel isn’t working I tried everything I can but no lucky, I even used google but nothing comes up.

    I’m trying to solve this Lab for up to 3 days now. I finished the rest but the Tunnel become obstacle I couldn’t finish it

    Any hints ?…

    Please Help.

    1. Thanks.. At last I solved this Lab.

      It’s was good experience it took me 4 days to solve this one

  7. Hello to all,

    Can anyone offer some guidance with the ping between R2 loopback and vice versa, despite many attempts i am still stumped.

    Regards

  8. Hi to all!
    I’m failing to ping from R2, the loopback of R2, even i enable RIPNG on this interface, even it is shown in ipv6 route rip from R3, when i ping it…it fails. What is wrong??

  9. could smb post a solution for this lab? My tunnel does not work, do not why, checked tunnel config and ipv6 mapping, and this config without static and dynamic routing? no idea how to solve it…

  10. ok, I managed to solve problem with tunnel – ip routing and caching on r6 was disabled – tricky πŸ™‚ but still no idea how to do config without static and dynamic routing…

  11. after 2 hours I found out what was wrong with R4 and R5 – static frame relay mapping had to be configured – never done it with ipv6- good experience πŸ™‚ ! still no idea about default route config on R1 – I tried configure R2 with RIPng + default information originate but still do not see default route in R1 routing table.. Rene, please give me a hint …

  12. I did it … !!! but in 3 hrs… got stucked at frame relay and general-prefix addresses … :):):)

  13. R1 is supposed to receive an IPv6 prefix from R2 through autoconfiguration but for some reason this is not working.

    Did anyone ever figure this out, its the only one I couldn’t get?

    1. Sorry I meant this objective, not the previous post.

      R1 should have an IPv6 default route in its routing table. You are not allowed to create a default route yourself or configure a routing protocol on R1.

  14. I only see the startup-config “IPv6 Troubleshooting – Startup Configuration” file.

    there is no pre-configured ip address on this file.

    can someone help me to find the correct file. I have already logged in. without any success to find the proper config file.

Comments are closed.