This might happen on Android if sockets are bound to the physical IP
address but packets are still routed via TUN device. Since it seems to
happen quite often (or for stuff that requires regular traffic) this
hides these messages from the default log.
Two callbacks can be registered that get called when new inbound plaintext and
outbound ESP packets have been processed. Inbound ESP and outbound plaintext
packets can be queued for processing with two other methods.
Tobias Brunner