On Sat, 10 Jun 2023 19:24:03 +0200
Ondřej Surý <ond...@isc.org> wrote:

> You are over-complicating things. If unconfigured, named binds the outgoing 
> UDP to 0.0.0.0 (::0), which means the chosen IP address is picked by the 
> kernel. You need to configure priorities on your interfaces in the kernel - 
> ip route is your friend.
> 
> And for goddess’ sake, don’t do anything wild like proposed round robin 
> across default routes. That would be a living hell to debug.
> 
> Ondřej
> --
> Ondřej Surý — ISC (He/Him)




If you have some external interfaces you *don't* want named to use, but might 
want other outgoing traffic to use, you would need some "policy based routing", 
which can get complicated. In Linux, this is controlled by "ip rule" (not "ip 
route").
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