NAT-T with IKEv2 IPSEC
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I think its just part of IKEv2 to do NAT Traversal in order for it to works if both ends source port must be fixed by a CGNAT if both ends are behind CGNAT and can't allow incoming.
So it be like this
USG60W <> ISP CGNAT <--> ISP CGNAT <> other USG
The here it the way NAT Traversal works both 500 and 4500 both ends nailed up
USG60W 10.0.0.2:4500 > 3.3.3.1:4500 > CGNAT 2.2.2.1:4500 > 3.3.3.1:4500 CGNAT 3.3.3.1 > 10.10.10.3:4500 other USG
which the othe USG does the same
other USG 10.10.10.3:4500 > 2.2.2.1:4500 > CGNAT 3.3.3.1:4500 > 2.2.2.1:4500 CGNAT 2.2.2.1 > 10.0.0.2:4500 USG60W
Then it Traversal
But if one end allows incoming you just need the other to be nailed up
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