Re: Split tunnelling

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On Tue, 2018-08-21 at 11:21 +0000, J.Witvliet@xxxxxxxxx wrote:
> See comment below.
> 
> -----Original Message-----
> From: Patrick O'Callaghan [mailto:pocallaghan@xxxxxxxxx]
> Sent: dinsdag 21 augustus 2018 11:49
> To: users@xxxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: Split tunnelling
> 
> On Mon, 2018-08-20 at 09:46 -0700, Samuel Sieb wrote:
> > On 08/20/2018 05:03 AM, Patrick O'Callaghan wrote:
> > > Has anyone got this to work in Fedora? To be clear, split tunnelling is
> > > when network traffic to some destinations (or for some apps) is
> > > tunnelled over a VPN, while the rest of the traffic goes through normal
> > > channels. I've tried messing with network namespaces, which would seem
> > > to be the way to go, but not managed to get everything lined up so far.
> > > All the howto's I've seen are for various flavours of Ubuntu.
> > 
> > I don't know about apps, namespaces might work for that but I haven't
> > had any reason to try that yet.
> > 
> > However, my openvpn connection only routes the private network subnets,
> > everything else goes over the regular network connection.
> 
> I'm not sure I understand what you mean by "private network subnets".
> You mean it does this automatically, or you configured it that way?
> 
> > The only
> > tricky part, which I haven't tried to solve, is that you can't resolve
> > private DNS entries from the VPN connection.  This would likely be a
> > problem with a work VPN, unless you let the work DNS resolve everything.
> 
> Indeed, that could be an issue.
> 
> Poc
> 
> 
> =====================================================================
> " To be clear, split tunnelling is
> > > when network traffic to some destinations (or for some apps) is
> > > tunnelled over a VPN, while the rest of the traffic goes through normal
> > > channels."
> 
> No, not exactly.
> That is more an example of the use of multiple routes.
> Destination-A goes through gateway-A
> Destination-B goes through gateway-B
> All-else goes through default-gateway...
> Either GW-A or GW-B could be VPN.
> 
> Split-tunneling is more that transmit and receive use different tunnels,
> Or traffic to SAME destination is load-balanced over multiple, parallel tunnels.

I'm following the terminology used in 
https://en.wikipedia.org/wiki/Split_tunneling, which is also used by my
VPN provider (ExpressVPN) and others (e.g. NordVPN). (ExpressVPN
actually support split-tunneling, but only for Windows and MacOS.) None
of these mention load-balancing or using different tunnels for transmit
and receive. Of course it wouldn't be the first time a technical term
is overloaded with several meanings.

poc
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