[strongSwan] Multiple connections same virtual pool without sharing FIXED

Tobias Brunner tobias at strongswan.org
Tue Oct 16 12:28:12 CEST 2018

Hi Marwan,

> 3. Client1 connects multiple devices to the VPN, each device has a
> unique virtual IP address and can be accessed through Client1’s VPN

How does it do that?  Do you mean it allocates addresses from to those clients?  (Without the server being aware of that,
which is not a good idea.)  Or does it NAT traffic from these devices to
the IP address it received from the VPN server?

> 6. Same as step3, however these devices are not accessible from
> Client1’s VPN and vice versa

So why not use distinct subnets?  Reaching these devices from other
hosts (e.g. behind the VPN server, or the server itself) could be tricky
if they have the same IP addresses assigned.  And depending on the
traffic selector on the server's side and whether you use marks this
will actually result in duplicate IPsec policies, which won't work.

And are you sure this would be easier with a site-to-site setup instead
of using virtual IP pools in the first place?  The IP addresses used on
the client end could still be "virtual IPs", i.e. only usable inside the
VPN, but they wouldn't be assigned by the server (to use duplicate
subnets is still tricky, though).


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