Re: Ping over IPv6 IP6IP6 tunnels not working

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On 3/22/24 05:57, Martin Maurer wrote:
> Hello,

Hi,

> I am using 2 Raspberry Pis and trying to establish tunnels: 2 for IPv4 
> and 2 for IPv6. I used separate ones, so in sum 4 tunnels.

I'm not sure why you're using two tunnels, but I seriously doubt that's 
causing any problems for you.

> I have done the following changes/calls:

I've quickly skimmed your commands and don't see anything that stands 
out as obviously wrong.

> $ sudo ping -6 -I mytunnel1ipv6 2001:4860:4860::8888
> ping: connect: Network is unreachable
> $ sudo ping -6 -I mytunnel2ipv6 2001:4860:4860::8888
> ping: connect: Network is unreachable
> $

I think "Network is unreachable" means that the kernel doesn't think it 
has a viable route to the network.

> I can also ping the "outer" (real) addresses:

Can you ping the inner IP address on the far side of the IP-IP tunnel?

If you can't ping the IP that you're trying to use as a gateway to get 
to the 2001::/4 network, the kernel would think that it doesn't have a 
functioning route.

> I know the 2001::/4 in "route add" is not useable for all Internet IPv6 
> addresses, but at least for these test pings that shall be enough?

Agreed.

> Someone an idea, what could be wrong/missing?

Start with basics, can you ping the far inside IP of the tunnel(s).

> Many thanks!

:-)



-- 
Grant. . . .

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