[strongSwan] Issue with authentication under IKEv1 + NAT

[jason zhan]

   If there  is NAT between  <Zyxel> and  <StrongSwan >,suggestion add below parameter in [ipsec.conf]

[ipsec.conf]
type=tunnel
aggressive=yes
forceencaps=yes
    
  by the way,most small  router use peer ID  when configure ipsec  ikev1 in graphical
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