[strongSwan] Ipv4 - Ipv6 Dual-stack

[Martin Willi]

> Something like "rightsourceip=<someIPv4pool>,<someIPv6pool>".

While you can define a mixed left/rightsubnet=1.2.3.4,ab::cd, we
currently do not support assignment of multiple addresses within a
single IKE_SA, independent from the address family.
You could use separated IKE_SAs for the different virtual IPs, but this
might be problematic with some clients.

Regards
Martin