GRE IPV6 Confusion!

Answered Question
Jun 19th, 2017
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I need some clarity on this type of GRE  configuration


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

@@@@@@@@@@@@@@@

1. What type of tunnel is this? is it plain old tunnel, and in that case is  in that case is is still necessary to have

tunnel mode ipv6 ?

2. Is it an ipv6 tunnel and the tunnel mode needs to be #tunnel mode ipv6 ? 

3. Is it always mandatory to have a tunnel mode ?

4. what is the difference between #tunnel mode gre ipv6  

& #tunnel mode ipv6 ?

Thanks in Advance

Correct Answer by Philip D'Ath about 1 month 5 days ago

Correct.

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Philip D'Ath Mon, 06/19/2017 - 20:35
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It is tunnelling IPv6 over IPv4.

lowfell Mon, 06/19/2017 - 21:10
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It is tunnelling IPv6 over IPv4

So in this instance is it mandatory to have #tunnel mode ipv6 ?

Philip D'Ath Mon, 06/19/2017 - 21:13
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It has to match the remote end - and it has to be a type that tunnels IPv6.


So you could use a different IPv6 tunnel mode - but you must have one.

lowfell Mon, 06/19/2017 - 21:19
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So if its                                                 R1#tunnel mode ipv6

then the other side has to be               R2#tunnel mode ipv6 ?


Or                                                        R1#tunnel mode gre ipv6

                                                            R2#tunnel mode gre ipv6     or whatever as long as they match? 

Correct Answer
Philip D'Ath Mon, 06/19/2017 - 21:20
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Correct.

lowfell Mon, 06/19/2017 - 21:27
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Thanks Philip. That's much appreciated.

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