Hi,

On Fri, Jan 26, 2018 at 10:20 AM, Jan Just Keijser <janj...@nikhef.nl> wrote:
> Hi Selva,
>
>
>
>
> 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.

Selva

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