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List:       shrew-vpn-help
Subject:    [vpn-help] 2.1.7 and Windows 7 hangs till reboot
From:       kvpn () live ! com (Kevin VPN)
Date:       2011-09-08 3:21:55
Message-ID: BLU0-SMTP232F814EA90F0575A4013C3A01E0 () phx ! gbl
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On 09/06/2011 07:46 AM, Michael Kolowicz wrote:
> Hello,
>
> i using without problems Client 2.1.7 on Windows XP. Now I installed it on
> Windows 7 x64. Same VPN Config as Windows XP to the remote Client.
>
> When I connect it works all fine. Then I disconnect from remote - my Windows
> 7 is not more able to connect Internet until I reboot the machine. Have
> someone an idea? What more information's are for you helpful`?
>

Hi Michael,

Do you by any chance have a program running that manages your network 
connections, for instance a program by the hardware vendor?  Laptops 
often have a 'connection manager' or something like that for managing 
wireless connections.

When Shrew establishes a VPN, it modifies the networking stack in 
Windows to add a virtual network adapter for the VPN and to 
intercept/redirect traffic through the VPN.  It also modifies Windows' 
routing table.

I wonder if perhaps some network manager program is also monitoring your 
network stack and gets confused by the virtual adapter.  For instance, 
when the VPN disconnects and the virtual adapter is removed, perhaps 
that manager program fails to allow the routing table to be reset back 
to the way it was before the VPN.

You can check the status of your routing table in Windows by opening a 
'cmd' prompt.  Issue the command 'route print' to see your routing table 
before connecting the VPN.  Then connect to the VPN and issue 'route 
print' again to see how it has changed.  Then disconnect and check 
'route print' a third time.  The routing table should be basically the 
same as the first.  The key route to observe should be the 'Network 
Destination' 0.0.0.0.


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