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 10.1.1.10
 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 10.1.1.9
!

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

Comments (9) 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:
    https://supportforums.cisco.com/t5/wan-routing-and-switching/is-tunnel-mode-a-mandatory-command-when-configuring-ipv6-tunnels/td-p/3007202

    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

    @ccnp
    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!!!!

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