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Re: I need help configuring IPv6

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> 
> On Feb 23, 2022, at 21:40, Nathan Van Ymeren <nathan.vany@gmail.com> wrote:
> 
> On Wed, Feb 23, 2022 at 8:24 PM Andika Triwidada <andika@gmail.com> wrote:
>> 
>> 
>> 
>>> On Thu, Feb 24, 2022 at 10:58 AM Nathan Van Ymeren <nathan.vany@gmail.com> wrote:
>>> 
>>> 
>>> The relevant portion of /etc/network/interfaces is:
>>> 
>>> iface eno1 inet6 static
>>>        address 2604:xxxx:xxxx:xxxx::2/64
>>>        gateway 2604:xxxx:xxxx:xxxx::1
>>> 
>>> As far as I can tell from reading the debian wiki and whatever else,
>>> it should work like this, but even ping6'ing the gateway gives "ping6:
>>> connect: Network is unreachable".  I can ping the gateway on its
>>> link-local (fe80) address, but that's all I can do.
>>> 
>>> Please help!
>>> 
>> 
>> Hi Nathan,
>> 
>> I think the first important step is to ensure that the gateway pingable
>> at its 2604:xxxx:xxxx:xxxx::1 address, both from your computer and from the internet.
>> 
>> Regards,
>> Andika
>> 
> 
> Sigh.
> 
> It seems that the missing piece of the puzzle was this:  You can't
> just add a default route (apparently).  You have to first add the
> route to a specific interface.  It's not clear to me if this is
> universally true, or just a consequence of something specific to my
> setup (the server in question has multiple NICs).
> 
> The tl;dr is that it's necessary for me to do the following in order:
> 
> # ip -6 route add blah:blah::1 dev eno1
> # ip -6 route add default via blah:blah::1
> 
> where blah:blah::1/64 is the address my datacenter gave me for the v6
> gateway router.
> 
> I wish this had been more clearly laid out in the umpteen different
> wikis and tutorials I've tried to follow.

That’s not documented because it’s not normal to have to add such a route. The kernel automatically adds that route. There is something wrong with your configuration. If you don’t obfuscate the information, we might be able to tell what’s wrong.

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Thread

I need help configuring IPv6 Nathan Van Ymeren <nathan.vany@gmail.com> - 2022-02-24 05:00 +0100
  Re: I need help configuring IPv6 Andika Triwidada <andika@gmail.com> - 2022-02-24 05:30 +0100
    Re: I need help configuring IPv6 Nathan Van Ymeren <nathan.vany@gmail.com> - 2022-02-24 05:50 +0100
    Re: I need help configuring IPv6 Nathan Van Ymeren <nathan.vany@gmail.com> - 2022-02-24 06:50 +0100
      Re: I need help configuring IPv6 Kenyon Ralph <kenyon@kenyonralph.com> - 2022-02-24 08:50 +0100
        Re: I need help configuring IPv6 Nathan Van Ymeren <nathan.vany@gmail.com> - 2022-02-24 08:50 +0100
          Re: I need help configuring IPv6 Pascal Hambourg <pascal@plouf.fr.eu.org> - 2022-02-24 22:10 +0100
            Re: I need help configuring IPv6 Nathan Van Ymeren <nathan.vany@gmail.com> - 2022-02-24 22:20 +0100

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