Endpoint address dns resolution - option to prefer IPv6 or IPv4

[Luis Ressel]

On Sat, Mar 14, 2020 at 06:08:35PM +0100, Matthias Urlichs wrote:
> Ideally some background process forked by `wg` or `wg-quick` should set
> the first address, monitor the peer, and use the next one if it hasn't
> been established after some configurable number of seconds (or when the
> keepalive fails). Bonus points for re-resolving the address when it expires.

Yes, trying the ips in order until a tunnel can be established is
certainly a good idea, and in fact what the relevant standards
recommend, but so far noone has bothered to implement it.

Running a daemon that periodically re-resolves the host and sets the
endpoint to its current ip, on the other hand, would interfere with
wireguard's transparent roaming support, so wg(8) isn't ever going to do
that. Of course, you can easily do this yourself if it makes sense for
your setup.

Cheers,
Luis