GRE IPv6

From: Matt Mullen (mullenm@gmail.com)
Date: Sat Mar 17 2007 - 17:20:57 ART

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Hi all,

I am having an issue with getting an IPv6 over GRE tunnel to come up. As
soon as I enter the 'tunnel mode gre ipv6' command on the tunnel interface,
the interface goes down and remains down. Here's the config:

interface FastEthernet0/0
ip address 155.1.10.1 255.255.255.0
ipv6 address 2001:1::1/64

interface Tunnel14
no ip address
ipv6 address 2001:14::1/64
tunnel source FastEthernet0/0
tunnel destination 155.1.4.4
tunnel mode gre ipv6

interface FastEthernet0/0
ip address 155.1.4.4 255.255.255.0
ipv6 address 2001:4::4/64

interface Tunnel14
no ip address
ipv6 address 2001:14::4/64
tunnel source FastEthernet0/0
tunnel destination 155.1.10.1
tunnel mode gre ipv6

I also tried defining loopback interfaces instead of using the physical
interfaces for tunnel source/destination, but get the same result. The
code is 12.4(10b). Is anyone else seeing this behavior?

Thanks,
Matt

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