Home > Ticket 15 – IPv6 GRE Tunnel

Ticket 15 – IPv6 GRE Tunnel

March 16th, 2015 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 (16) Comments
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  1. 戦艦
    November 15th, 2017

    R3:show ipv6 ospf neighbor

  2. Greg
    December 6th, 2017

    Still valid but not able to ping 2026::1:2 from R1

  3. Fattah RazzaqghanimughnI
    January 5th, 2018

    on packet tracer lab:
    Ans1) R4
    Ans2) IPv4 and IPv6 interoperability
    Ans3) under “interface tunnel 34”, execute command “no tunnel mode”

  4. Frankie96
    January 9th, 2018

    There is no s0/0/0.34 sub interface on R4.. is the topology diag incorrect? Can networktut advise?

  5. CCNP
    January 10th, 2018

    Per JJ link:

    Since : ‘tunnel mode ipv6’ is mandatory
    The tunnel will function without the tunnel mode command, but not as an IPv6 tunnel.
    Ticket is IPv6 ticket in this case.
    can network tut or any one explain if it ‘tunnel mode ipv6’ is mandatory why “remove tunnel mode” or “no tunnel mode”

  6. CCNP
    January 10th, 2018

    Will it also fix issue if add “tunnel mode ipv6” to R4? Both sites have the same configurations

  7. emk
    January 11th, 2018

    no, there is no ipv6 config on r3/4 s0/0/0/34 interfaces. so you want to use v4 to transport v6

  8. CCNP
    January 13th, 2018

    Thank you emk for the explaination!!!!

  9. Test
    February 2nd, 2018

    Ticket 15 – IPv6 GRE Tunnel

    Can somebody please let me know how to identify the above TICKET ?

  10. Test
    February 3rd, 2018

    Question 1
    Gre Tunnel Header Mandatory and Optional ??
    Mandatory: Reserved0, Version, Protocol Type
    Optional: Checksum, Reserved1, Key, and Sequence Number

    Question 2
    Gre tunnel Header,which one is standard,witch one Extended? (4 Standard,2 Extended)

    Standard Header :Reserved0 , Version , Protocol Type , Checksum , Reserved1
    Extended Header : Key , Sequence Number

    For the above two DnD is there like a sequence in which we have to drop them ?

  11. Hunter
    February 9th, 2018


    No particular sequence needed to drop. Just Drop em into the correct boxes.

  12. Hunter
    February 9th, 2018

    IPv6 tickets are on R2, R3, R4. Narrow down pinging loss and figure which two routers are not having routes..
    IPv6 Ping Plan
    R1#ping ipv6 2026::1:2 (Can you reach the R3 Area 0 interface)
    No –> IPv6 OSPF
    Yes R1# ping ipv6 2026::34:2 (Can you reach the R4 GRE tunnel interface)
    No –> IPv6 GRE Tunnel
    Yes –> IPv6 RIPng OSPFv3
    You can also determine the answer using sh ipv6 ospf nei on DSW1.
    No routes for ospf area 12 (2026::12) –> R2: IPv6 OSPF Routing
    No routes for ospf areas 12, 0, or 34 –> R3: IPv6 GRE Tunnel
    All ospf routes for areas 12, 0, & 34 –> R4: IPv6 RIPng OSPFv3 redistribution

    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)

    February 23rd, 2018

    When show ipv6 route is done on R4, tunnel 34 is built although it is built but if it is confirmed by int tunnel 34, there is an error in the tunnel protocol and it can not be constructed. Is sh ipv6 route output error?

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    March 2nd, 2018

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  15. Rollodus
    March 15th, 2018

    Of course, again the simulator it is useless, allow me to demonstrate:
    interface Tunnel34
    no ip address
    mtu 1476
    ipv6 address 2026::34:1/122
    ipv6 ospf 6 area 34
    tunnel source Loopback3
    tunnel destination
    tunnel mode ipv6ip

    interface Tunnel34
    no ip address
    mtu 1476
    ipv6 address 2026::34:2/122
    ipv6 ospf 6 area 34
    tunnel source Loopback4
    tunnel destination
    tunnel mode ipv6ip

    I has nothing to do -again- with the answer– the client can ping the web server, without any fixes, it defeats the purpose from the very beginning…so what other options are there, learn by hear as a parrot???

    Sorry to say this: the guy that put together it is an IDIOT!!!!You either to a thing insanely good, or better don’t do anything that other can’t use!!!!

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