Home > Ticket 15 – IPv6 GRE Tunnel

Ticket 15 – IPv6 GRE Tunnel

April 22nd, 2018 in TSHOOT v2 Go to comments

Problem: Loopback address on R1 (2026::111:1) is not able to ping the loopback address on DSW2 (2026::102:1).

Configuration of R3:
interface Tunnel34
 no ip address
 ipv6 address 2026::34:1/122
 ipv6 enable
 ipv6 ospf 6 area 34
 tunnel source Serial0/0/0.34
 tunnel destination
 tunnel mode ipv6

Configuration of R4:
interface Tunnel34
 no ip address
 ipv6 address 2026::34:2/122
 ipv6 enable
 ipv6 ospf 6 area 34
 tunnel source Serial0/0/0
 tunnel destination

Ans1) R3
Ans2) Ipv4 and Ipv6 Interoperability
Ans3) Under the interface Tunnel34, remove ‘tunnel mode ipv6’ command

Comments (30) Comments
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  1. vl
    April 5th, 2016


    In Ticket 15 @ exam – What about first trying various strategic IOS verification commands on R3 like e.g.

    R3#show ipv6 route ospf – (no OSPFv3 working routes via Tunnel34 towards R4 etc.!) – and:
    R3#show ipv6 ospf neigh – (No OSPFv3 working neighbor R4) – and:
    R3#show ipv6 int brief – (IPv6 I/F Tunnel34 seems to be down!) and:
    R3#sh ipv6 ospf int tun34 – (Bad OSPFv3 Tunnel34 I/F detailled info)

    To make sure we’re dealing with the specific R3/R4 Tunnel 34 problem – BEFORE blindly examining and comparing the R3 / R4 running-configs!?

  2. AL
    April 22nd, 2016

    can anyone tell me that in the test for TICKET QUESTION, it would said TICKET OSPF AUTHENTICATION, NAT ACL, ETC. thanks

  3. Anonymous
    April 23rd, 2016

    @ Al
    u only need 2 knw khartak strategy
    adapt the strategy by join networktut and write d strategy down during xam and u r gud 2 go
    passed March 23rd with 1000 / 1000

  4. almomo
    April 28th, 2016

    Where is khartak strategy?

  5. Anonymous
    May 1st, 2016

    does anyone know if there is a similar site for CCIE and Security ?

  6. Sharing_Is-Caring,
    May 9th, 2016


  7. Sharing_Is-Caring,
    May 9th, 2016

    Strangely enough, I have had this ticket three times, and I missed the first two because of not paying attention fully, and because I haven’t scrolled down to see all possible answers.

  8. Searching1
    June 5th, 2016

    1 question
    why do we need to remove tunnel mode ipv6 ?

  9. NetAdmin
    June 13th, 2016

    I had questions about this one as well it says the problem is on R3 but it should be R4 it’s the router that doesn’t have “tunnel mode ipv6” on it is this a typo with 9tut or with Cisco?

  10. TshootNewbei
    July 5th, 2016

    Actually its not a typo, you can leave a tunnel without a mode, by default if no mode is specified it will be GRE by default. I am not sure but leaving it blank will have the same result as typing the ipv6 mode on both. The error we will get here in this scenario will be mismatch of tunnel mode, that is why we have to remove ipv6 mode which is the preferred answer by cisco as for this exam (there would be other solutions in the real world applications).

  11. Shaka
    July 18th, 2016

    This may sound a silly question: On the trouble tickets for third answer can actually make the change to correct the issue in global configuration mode? I read on here that you can only use ‘show commands’ which means you don’t actually make a change. Do you just write in the answer for the 3rd question in each trouble ticket?

  12. LanChaw
    July 28th, 2016

    -> The ticket seems wrong one comparing with the practice files.
    For the practice ticket 15, problem lies in DSW1 as wrong ip helper-address is provided.
    To solve the ticket do the following :

    DSW1(config)#int vlan10
    DSW1(config-if)#no ip helper-address
    DSW1(config-if)#ip helper-address


  13. Stuart
    July 29th, 2016


    Well, due to the PT TT#15 Lab FILENAME:

    PT 642_832 TSHOOT Ticket 15.pkt

    That Lab seems to be a PT Ticket # 15 Lab, made for a FORMER IP Helper Problem – (the issue You’re mentioning above), which was present at the former but NOW OBSOLETE 642-832 TSHOOT Exam.

    Alternatively the NEW 300-135 Exam by today includes the actual TSHOOT TT#15: IPv6 GRE Tunnel Problem described on top of this page!

    Think this must be the explanation for your issue!?

  14. CCNP-guy
    August 10th, 2016

    yes the PT ticket 15 is OLD and Wrong. It point to DSW1 and does not even mention IPV6
    do not use it ! not related to actual test at all

  15. CCNP-guy
    August 10th, 2016

    A1 ) r3
    a2) ipv4 & ipv6 interop
    a3) remove “tunnel mode ipv6” cmd

  16. CCNP-GUY
    August 12th, 2016

    PT ticket #15 in totally invalid. it is based on old exam. it has nothing to do with the real TT15 Question
    can some pls update it

  17. sonic
    August 14th, 2016

    PT 300_135 TSHOOT Ticket 15.pkt

    the ticket is complete. no fix need. can someone explain me?

  18. sonic
    August 16th, 2016

    is ilogic the answer:
    remove ‘tunnel mode ipv6’ command

    because remove the ipv6 the ping ipv6 dont run.

  19. Kb
    August 22nd, 2016

    Hi Networktut,
    Ticket 15 – IPv6 GRE Tunnel
    Problem: Loopback address on R1 (2026::111:1) is not able to ping the loopback address on DSW2 (2026::102:1).

    Is 2026::102:1 loopback address for DSW1 or DSW2?
    I thought right answer is DSW1’s loopback address.
    Please answer me for correction.

  20. Dampyr
    August 22nd, 2016

    So,what’s the right answer to this question?
    Tunnel mismatch between R3 and R4 (if so,on which device is error-R3 or R4) ?
    is remove ‘tunnel mode ipv6 valid ?
    Thanks ?

  21. cls
    August 24th, 2016

    What is the purpose of the tunnel if traffic can go through s0/0/0.34

  22. MB
    August 26th, 2016

    Tunnel 34 simply transports IPv6 “Passenger” Traffic to/from R3/R4 within the TSHOOT Topology!

  23. CCNP-1000
    September 15th, 2016

    I made it
    I pass the exam today with score of 1000/1000 it took me 70 minute to finished it.

    I had the latest dumps all off them was garbage. I just study this website go for premium.
    I read all the comments and practice all the tickets on website and PT and gns3.

    To pass the exam with score of 1000 this website it’s enough but to survive out there you have to study hard, by hard i mean hard! Out there the person who knows one line more its the winner so passing this exam its jut the beginning of your study’s.

    Enough said this is how i did it : (i found this strategy on this website bye the ccnp-guy)

    You have to ask your self Is it ipv4 or ipv6?

    If IPv6 you have these 3 questions, 1 each on
    R2: (T12) IPv6: enable ospf 0
    R3: (T15) IPv6: remove “tunnel mode ipv6″
    R4: (T16) missing Redistribution from RIPng to OSPFv3

    If its IPv4 do the following to narrow it down:

    From Client 1 ping if its :

    OK? = 3 tickets on R1:
    (T03) Wrong IP of BGP neighbour
    (T04) NAT – ACL mis-configured
    (T05) WAN ACL statement missing

    If you cant ping try to ping from client 1

    OK? = 1 ticket on R1:
    (T01) OSPF Authentication

    If you cant ping try to ping from client 1

    OK? = 2 tickets on R4:
    (T11) Redistribute ospf to eigrp (“to” & -> )
    (T14) EIGRP Passive Interface

    If you cant ping 10.2..1.1 you have 4 ticket as follow:

    NO? = 1 ticket on DSW1:
    (T06) VLAN filter

    or = 3 tickets on ASW1:

    (T08) Access port not in VLAN 10
    (T09) Port Channel not allowing VLAN 10,200
    (T07) Port Security

    I also had multiple choice questions and Eigrp and ospf simlets

    Good luck to you all.
    This is just the beginning so study hard.

  24. Dinesh
    September 20th, 2016
  25. KFH
    October 1st, 2016

    I don’t understand.
    why do we need to remove tunnel mode ipv6 ?

  26. hamza butt
    October 4th, 2016

    @net plz share right ans of this ticket thnks..

  27. Another method
    October 8th, 2016

    This is my TSHOOT IPV6 using show ip route method, let me know if it all seems good.

    ipv6 ospf 6 area 0 – R2
    R1 and R2 are not ospf6 neighbors with each other, after runing sh ipv6 ospf nei. R2 has no
    interfaces in area 0. As a result, R1 will have no OI routes for area 0 (2026::1) nor 2026::34 (area 34) that connects to area 0. But DSW will have routes for area 0 (2026::1) and 2026::34 (area 34), but not area 12 (2026::12)

    IPV6 Tunnel problem – R3
    R4 has no ospf6 neighbors because the tunnel mode on R3 is not compatible. As a result
    R3 will have no redistributed routes (OE2) from the DSW Ripzone (2026::3), (2026::102), and DSW will not have any routes to the OSPF6 network area 0 (2026::1), 2026::34 (area 34), or area 12 (2026::12)

    Redistribute Ripzone into OSPF -R4
    No missing ospf neighbors but R3 has no redistributed routes (OE2) from the DSW Ripzone (2026::3), (2026::102). DSW1 will however have routes to ALL OSPF6 area 0 (2026::1), 2026::34 (area 34) and area 12 (2026::12)

  28. ccnp-mx
    October 13th, 2016

    This ticket is correct. You need to remove the tunnel mode ipv6 in order to use the default gre mode. I cleared tshoot with 1000/1000.

  29. Guest
    October 14th, 2016

    @ccnp-mx Hi

    Congrate , when was your exam ? same questions ?

  30. Jack
    October 18th, 2016


    why is the answer for question 2 -Ipv4 and Ipv6 Interoperability- if their is no ipv4 communication? its all ipv6?

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