The hosts moon, sun and dave install transport-mode trap
policies with right=%any. The remote host is dynamically determined based on
the acquires received from the kernel. Host dave additionally limits the remote
hosts to moon and sun with rightsubnet. This is tested by
pinging sun and carol from moon, carol from sun, and
sun and moon from dave. The latter also pings carol, which
is not going to be encrypted as carol is not part of the configured rightsubnet.