References: <1509930876-30728-1-git-send-email-selva.nair@...277...>
 <1516815105-17882-1-git-send-email-selva.nair@...277...>
 <2f187b23-c53f-94cb-6a58-d5c9c14b5da1@...1147...>
 <663a0e1d-0d21-6f40-851e-78d770bec68f@...1147...>
 <CAKuzo_i4Ge=3cbg3zZY61ps+wDi8eCC1M4dopNJKGoB-LmT0Qw@...278...>
 <cba28408-81d0-5295-c882-f4bfdfcc20c3@...1147...>
 <CAKuzo_gCvfSYi+u4XJd88te-B_XbW1AkEQ3LxsuHaAH29EDVrw@...278...>
From: Jan Just Keijser <janjust@...1147...>
Message-ID: <d6470547-c05a-926e-6f30-4a2f6342cccf@...1147...>
Date: Fri, 26 Jan 2018 16:33:18 +0100
MIME-Version: 1.0
In-Reply-To: <CAKuzo_gCvfSYi+u4XJd88te-B_XbW1AkEQ3LxsuHaAH29EDVrw@...278...>
Content-Language: en-US
Subject: Re: [Openvpn-devel] [PATCH v3] Use lowest metric interface when
 multiple interfaces match a route
List-Id: <openvpn-devel.lists.sourceforge.net>
List-Unsubscribe: <https://lists.sourceforge.net/lists/options/openvpn-devel>, 
 <mailto:openvpn-devel-request@lists.sourceforge.net?subject=unsubscribe>
List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=openvpn-devel>
List-Post: <mailto:openvpn-devel@lists.sourceforge.net>
List-Help: <mailto:openvpn-devel-request@lists.sourceforge.net?subject=help>
List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/openvpn-devel>, 
 <mailto:openvpn-devel-request@lists.sourceforge.net?subject=subscribe>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Transfer-Encoding: 8bit
To: Selva Nair <selva.nair@...277...>
Cc: openvpn-devel <openvpn-devel@lists.sourceforge.net>

Hi,

On 26/01/18 16:26, Selva Nair wrote:
> On Fri, Jan 26, 2018 at 10:20 AM, Jan Just Keijser <janjust@...1147...> wrote:
>>
>> On 26-Jan-18 16:08, Selva Nair wrote:
>>
>>>> arrrgh, the important line is missing:
>>>>    ERROR: Windows route add ipv6 command failed: returned error code 1
>>> Gert has explained the fe80::8 magic.
>>>
>>> Here is my guess about the ERROR: The route already existed and so
>>> errored trying to add again -- most likely from a previous run as it
>>> seems we have a problem in deleting the route on exit (I guess this is
>>> on Windows 10) (see Trac 1003:
>>> https://community.openvpn.net/openvpn/ticket/1003 )
>>>
>>> "netsh int ipv6 show route" will confirm that.
>>>
>>> The route destinations have their host bits zeroed out before setting
>>> route, but those bits reappear (which is strange)  in route delete.
>>> And netsh doesnt like that at least on Windows 10. Gert, any idea why
>>> this happens?
>>>
>> this is on *Windows 7*  and indeed that route is never deleted when OpenVPN
>> exits. Here's the error associated with *that*:
>>
>> Fri Jan 26 16:13:08 2018 ERROR: Windows route delete ipv6 command failed:
>> returned error code 1
>> Fri Jan 26 16:13:09 2018 NETSH: C:\Windows\system32\netsh.exe interface ipv6
>> delete address vpn0 2001:610:120::200:0:1001 store=active
>> Fri Jan 26 16:13:09 2018 TAP: DHCP address released
>>
>> C:\Users\janjust\OpenVPN\config> C:\Windows\system32\netsh.exe interface
>> ipv6 delete route 2001:610:120::200:0:1001/112
>> interface=17 fe80::8 store=active
>> The parameter is incorrect.
> The error is due to the host part (1001) in the route destination --
> changing that to
> C:\Windows\system32\netsh.exe interface  ipv6 delete route
> 2001:610:120::200:0:/112
> should succeed.
>
> The mystery (at least for me)  is where that host part is coming
> from... Its zeroed out before setting the route, and I thought the
> same (?) route list pointer is passed in while deleting routes.
>
>
that also did not work; what does work is:
   C:\Windows\system32\netsh.exe interface ipv6 delete route 2001:610:120::200:0:0/112

so indeed, the host part is added at deletion time.

HTH,

JJK