Public IPv6s fail on KVM bridge with "No buffer space available"

[Alarig Le Lay]

On lun. 22 mai 14:03:54 2017, William Gathoye wrote:
> Btw, if I wanted to use link local addresses to communicate with the
> provider next hop gateway, how can I know the local link fe80 IPv6
> address of that gateway since my provider (OVH) doesn't disclose it?

You can try to ping6 the IPv6 multicast address for all the routers on
the link:

14:07 alarig at mew ~ % ping6 -c1 ff02::2%vtnet0
PING6(56=40+8+8 bytes) fe80::a800:ff:fe93:83a3%vtnet0 --> ff02::2%vtnet0
16 bytes from fe80::209%vtnet0, icmp_seq=0 hlim=64 time=0.237 ms

--- ff02::2%vtnet0 ping6 statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.237/0.237/0.237/0.000 ms

But, it’s possible that you don’t get any reply if they do some nasty
things on their network (as Hetzner does). In that case, you’re stuck on
the /56 setup.

-- 
alarig
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