[strongSwan] fail to set up tunnel with examples

[Tu, Robin]

I refer to this example
https://www.strongswan.org/testing/testresults/ikev2/shunt-policies-nat-rw/index.html

But I found that if I didn't setup rightid in sun's ipsec.conf like this example. The connection will fail.
"...
Received INTERNAL_ADDRESS_FAILURE notify, no CHILD_SA built
Fail to establish CHILD_SA,keeping IKE_SA
Establishing connection  'nat-t' failed.

I run strongswan 5.1.2 in sun gateway with Ubuntu 14.04 and  in alice client, it's strongwan 5.3.5 in Ubuntu 16.04
I wonder if it's bug in 5.1.2?
Best Regards
Robin

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