On 2019-11-28 18:41, Ralph Seichter wrote:

> >  What am I missing?
> 
> I can't really tell, based on what you posted. Is there an IPv6 Router
> Advertisment service running, either on your router or another machine
> in your local network?

Thanks for answering; I got a bit further meanwhile.  The first reason my
initial tests (following your advice literally) didn't work was that my
router does _not_ assign fe80::1 to itself, but rather some other
arbitrary address in the fe80 prefix; on close inspection it looks based
on the MAC address just like a host is supposed to do.  When I ping6 or
traceroute6 that specific address, it works.

Secondly, while the router seems to obtain a delegated prefix from
upstream, it doesn't assign any address from that range to the internal
interface.  The only ipv6 addresses on the internal interface are the
link-local address and the ULA address.  Is that normal?

I did enable the router advertisement feature, and I checked that the
daemon is running on the router.  But I can see no output related to
that when I run tcpdump on the desktop system.

> Here is some data from the Gentoo machine I am currently working on. It
> is hosted in a data center and uses a /64 subnet. I obfuscated the IP
> addresses, but I'm sure you get the gist:
> 
> # cat /etc/conf.d/net
> dns_domain_lo="example.com"
> modules="iproute2"
> config_enp0s31f6="99.88.77.50/26
> 2a01:11:22:33::44/64"
> routes_enp0s31f6="default via 99.88.77.1
> default via fe80::1"

... so  you _do_ self-assign a static ipv6 address after all.  How do
you know it is the right one?

> In my home network, my FRITZ!Box router assigns both a ULA and a global
> scope address to each client, without any manual configuration on the
> clients. The optional ULA assignment means that, should my uplink
> connection die, the local clients can still talk to each other.

My router doesn't give me a global address.  Its documentation is at the
url below and I think I have followed it correctly.

https://openwrt.org/docs/guide-user/network/ipv6/start

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