Dualstack IPv4/IPv6 setup with directors

[Heiko Schlittermann]

Hi,

still using 2.2.9, I've two directors, and these directors
use both IPv4/IPv6 addresses.

`host directors.<domain>` returns one A and AAA for each
of the two directors:

    directors.<domain> has address 149.x.y.96               (director1)
    directors.<domain> has address 149.x.y.97               (director2)
    directors.<domain> has IPv6 address 2001:x:y:f33::5:1   (director1)
    directors.<domain> has IPv6 address 2001:x:y:f33::5:2   (director2)

But connecting the the neighbor director gives:

Oct 13 21:23:29 director1 dovecot: director: Warning: Director 2001:x:y:f33::5:2:9090/left disconnected us with reason: Invalid input: ME 149.x.y.96 9090
Oct 13 21:23:29 director1 dovecot: director: Error: director(149.x.y.97:9090/out): connect() failed: Connection refused
Oct 13 21:23:29 director1 dovecot: director: Warning: net_connect_ip(): ip->family != my_ip->family
Oct 13 21:23:29 director1 dovecot: director: Error: Remote director thinks it's someone else (connected to 2001:x:y:f33::5:1:9090, remote says it's 149.x.y.96:9090)

I assume it's because the director uses only one (IPv4 OR IPv6) address
for it's own identity, right? 

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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