>[оверквотинг удален]
> (5)   NAS-Port-Id = "IKEv2+EAP"
> (5)   NAS-IP-Address = %EXT-IP-VDS%
> (5)   Called-Station-Id = "%EXT-IP-VDS%[500]"
> (5)   Calling-Station-Id = "%EXT-IP-CLIENT%[500]"
> (5)   User-Name = "%radius-username%"
> (5)   Framed-IP-Address = 10.255.24.2
> (5)   NAS-Identifier = "strongSwan"
> IP адреса, логины и пароли изменены.
> Буду рад совету.
> Заранее благодарен.

В дополнение, кусок лога. Атрибут дублируется:
Framed-IP-Address = 10.255.24.2
Framed-IP-Address = 10.255.24.12

Sat Mar 19 13:25:24 2022
        Acct-Status-Type = Stop
        Acct-Session-Id = "1647688010-74"
        NAS-Port-Type = Virtual
        Service-Type = Framed-User
        NAS-Port = 74
        NAS-Port-Id = "IKEv2+EAP"
        NAS-IP-Address = %EXT-IP-VDS%
        Called-Station-Id = "%EXT-IP-VDS%[500]"
        Calling-Station-Id = "%EXT-IP-CLIENT%[500]"
        User-Name = "%radius-username%"
        Framed-IP-Address = 10.255.24.2
        Framed-IP-Address = 10.255.24.12
        Acct-Output-Octets = 184630
        Acct-Output-Packets = 374
        Acct-Input-Octets = 140713
        Acct-Input-Packets = 348
        Acct-Session-Time = 390
        Acct-Terminate-Cause = User-Request
        NAS-Identifier = "strongSwan"
        Event-Timestamp = "Mar 19 2022 13:25:24 UTC"
        Tmp-String-9 = "ai:"
        Acct-Unique-Session-Id = "87126f7fa0835846260efa39b8e90656"
        Timestamp = 1647696324