* Gert Doering <g...@greenie.muc.de>:

> "man openvpn" has a bit 
> 
> .B \-\-block\-outside\-dns
> Block DNS servers on other network adapters to prevent
> DNS leaks. This option prevents any application from accessing
> TCP or UDP port 53 except one inside the tunnel. It uses
> Windows Filtering Platform (WFP) and works on Windows Vista or
> later.

Seen that after I updated the server package...

> Yes.  But you need to either push it, or configure it as
> 
>   setenv opt block-outside-dns
> 
> which will make the "unrecognized option" bit a warning only, not a fatal
> (when pushed, it's always warning-only)
> 
> Plus, it only works on Vista+, so on XP it will trigger an error (or warning,
> same rules as for the option itself on Linux/Mac)

Currently I'm pushing it. No ill side effects so far.
 
> It might need to be pushed along with "register-dns", or a configured --up-

We're pushing that for years now :)

> script that does "ipconfig /registerdns" to make sure that Windows really
> really understands that "hey, there is new nameservers, please USE THEM!!!"
> - otherwise some testers reported DNS latencies in the first few minutes
> of VPN usage.

A side issue there with register-dns:
https://community.openvpn.net/openvpn/ticket/570

-- 
Ralf Hildebrandt                   Charite Universitätsmedizin Berlin
ralf.hildebra...@charite.de        Campus Benjamin Franklin
http://www.charite.de              Hindenburgdamm 30, 12203 Berlin
Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155

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