On 20/08/2019 19.49, James Knott wrote:
On 2019-08-20 01:42 PM, Carlos E. R. wrote:
It breaks mail in the sole machine which has the tunnel, which is the one that mails to me on my phone to tell me that my home IP has changed. If the machine happens to see IPv6 and prefers it, then mail breaks.
Given your mail server is IPv4 only, how would that happen?
I did not know that till some minutes ago when I read your mail... I assumed that of course they'd have it on IPv6, without looking. But I did look suse, and suse.com doesn't have IPv6 address, which I found curious.
It will only prefer IPv6 if the destination has an IPv6 address. Even if it had an IPv6 address, you could always force IPv4 by adding your mail server IPv4 address to /etc/hosts. Then, an IPv6 address will never be seen, as your computer won't go to an external DNS server for that host name. You could do similar, if you have a local DNS server.
-- Cheers / Saludos, Carlos E. R. (from 15.0 x86_64 at Telcontar)