On Wed, Feb 23, 2022 at 8:24 PM Andika Triwidada <and...@gmail.com> wrote: > > > > On Thu, Feb 24, 2022 at 10:58 AM Nathan Van Ymeren <nathan.v...@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.
