Hi

>
> Thanks for the hint Selva. Indeed it looks like something DNS related.
> The primary wired network interface has 1 IPv4-listening DNS server
> (192.168.1.1, which uses 2 upstream IPv4-listening DNS server from the
> ISP). The tun device has 2 IPv4 listening DNS servers (google) and 2
> IPv6 listening DNS servers (google) pushed via dhcp-option DNS.
>
> When it is "not working", the DNS server from the wired network
> interface (192.168.1.1) is used. When it is "working", as when the
> metric for the tun/tap adapter is changed to be lower than primary wired
> network interface, google IPv6 listening DNS server is used.

Apparently that's how Windows work. Use --block-outside-dns if you
want to be sure that the DNS servers set on the tun/tap is used. That
will block dns traffic via all other interfaces and also lower the
metric of tun interface.

Selva

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