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New Member

GRE IPV6 Confusion!

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

Everyone's tags (4)
1 ACCEPTED SOLUTION

Accepted Solutions
VIP Purple

Correct.

Correct.

7 REPLIES
VIP Purple

It is tunnelling IPv6 over

It is tunnelling IPv6 over IPv4.

VIP Purple
New Member

It is tunnelling IPv6 over

It is tunnelling IPv6 over IPv4

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

VIP Purple

It has to match the remote

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.

New Member

So if its                    

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? 

VIP Purple

Correct.

Correct.

New Member

Thanks Philip. That's much

Thanks Philip. That's much appreciated.

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