Preferring internal IPv6 source address over gif tunnel IP?

[Patrick M. Hausen]

Hi!


> Am 31.07.2019 um 14:07 schrieb Viktor Dukhovni <viktor at dukhovni.org>:
> Since a bunch of my traffic is SMTP, I need reverse resolution for
> outgoing IPv6, which means that I need the outgoing sources address
> to be <my-network>::1, not <tunnel-prefix>::2, even though the
> routing table lists "gif0" as the interface with the default route.
> 
> Is it possible to configure my system to use the internal /64 address
> as the default source address of outgoing IPv6 packets?

That is probably pretty easy depending on your preferred mail server.
Make your mail server listen to <internal>::1 only instead of ::

It will then automatically accept connections on that address and use
it for outbound, too, because it does not have a choice.

Add IP4c and loopback of course.

E.g. for Sendmail:
https://www.computing.net/answers/linux/sendmail-bind-to-ip-address/31045.html

HTH,
Patrick
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