As you can see in the log, you receive two IP addresses, but the remote
traffic selector is IPv4 only:
Nov 20 14:32:11 XXXXXX-ThinkPad-T500 charon-nm[2427]: 14[IKE] installing new
virtual IP X.X.88.100
...
Nov 20 14:32:11 XXXXXX-ThinkPad-T500 charon-nm[2427]: 14[IKE] installing new
virtual IP XXXX::XXXX:2
...
Nov 20 14:32:11 XXXXXX-ThinkPad-T500 charon-nm[2427]: 14[IKE] CHILD_SA VPN 1{3}
established with SPIs c2f6d125_i 2b492941_o and TS X.X.88.100/32 === 0.0.0.0/0
So the remote box either has no IPv6 traffic selectors configured, or it
does not support multiple subnets/families per CHILD_SA. Unless Fortinet
added support for the latter recently, that might actually be the case,
considering users reported this before on our wiki
(https://wiki.strongswan.org/projects/strongswan/wiki/Fortinet).
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https://bugs.launchpad.net/bugs/1905565
Title:
IPv6 over IPv4 IPSec tunnel communication error
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