It's because you're doing it wrong. You must *not* use the dhcp plugin of 
strongSwan to request the IP. Have Windows do a DHCP request over the VPN 
(according to the article it should do that). The dhcp plugin does something 
completely different.

On 09.08.2018 08:07, Christian Salway wrote:
> Perhaps the answer is to set the attr DHCP to the IP of the DHCP server 
> inside the VPN but then still, how does the client know how to route to the 
> IP address.
> 
> There doesn’t seem to be a solution for this even though all the parts are 
> there.
> 
>> On 8 Aug 2018, at 15:15, Noel Kuntze 
>> <noel.kuntze+strongswan-users-ml@thermi.consulting> wrote:
>>
>> Hello Christian,
>>
>> I guess the native Mac OSX client just doesn't support being connected to 
>> more than one server, so this can't be solved with it.
>>
>> For Windows, you need to setup and run a DHCP server on the VPN server, 
>> which answers the DHCP requests that Windows (uniquely and only Windows!) 
>> sends over the VPN. You can use that to push routes to the client. Just use 
>> the same options as with "real" DHCP clients, requesting configuration 
>> from/on the LAN. This is described in the article about Windows 
>> interoperability[1].
>>
>> [1] 
>> https://wiki.strongswan.org/projects/strongswan/wiki/WindowsClients#Split-routing-on-Windows-10-and-Windows-10-Mobile
>>
>> Kind regards
>>
>> Noel
>>
>>> On 07.08.2018 09:07, Christian Salway wrote:
>>> Hello all,
>>>
>>> After several months of using strongSwan, I still can't get the routing to 
>>> work correctly on the clients.  I have run out of pages to read on the 
>>> strongswan website so I hope you can help me out.
>>>
>>> The problem is when I connect to strongSwan, the routing is not configured 
>>> correctly on the clients (OSX and Windows) - using native (built-in) 
>>> clients. All updated with the latest patches/updates.
>>>
>>> OSX will set up a route based on the local_ts but when I open a 
>>> simultaneous connection to another strongSwan server, it removes the route 
>>> from the first VPN connection and adds it's own based on the local_ts.
>>>
>>> WINDOWS doesnt add the route at all.
>>>
>>> In either cause, I normally have to manually add the routes in.
>>>
>>> Has anyone had any success? Can they please shed some light as to how they 
>>> achieved it?
>>>
>>>
>>> Kind regards,
>>>
>>> *Christian Salway*
>>> IT Consultant - *Naimuri*
>>>
>>> T: +44 7463 331432
>>> E: christian.sal...@naimuri.com <mailto:christian.sal...@naimuri.com>
>>> A: Naimuri Ltd, Chandlers Point, Manchester M50 2UW
>>>
>>

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