Re: IPv6 GRE tunnel

Hi William,

On Fri, 2011-03-11 at 15:53 -0500, William Cerveny wrote:
> Hi Kilian,
> 
> I'm aware of IPv6 in IPv6 tunneling, but I really did want GRE tunneling
> over IPv6 to reduce variability between IPv4 and IPv6 environments for a
> specific application.
> 
> I'm sort of puzzled why GRE isn't implement with "ip" in IPv6.

as you can clearly see from the ip_gre module code in linux-2.6
(http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=net/ipv4/ip_gre.c;hb=b790e01aee74c23a5d92576177934f13aa51f718) there is no 128bit representation for source/destination and thus no ipv6 support built in. I guess that's why you will fail setting it up with iproute even if the client would allow to use ipv6.

-- 
Best regards,
Kilian

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