-The roadwarriors <b>carol</b> and <b>dave</b> set up a connection each
-to gateway <b>moon</b> using the <b>IKEv2</b> key exchange protocol. The
-authentication is based on <b>X.509 certificates</b>. <b>dave</b> advertises
-the support of the IKEv2 fragmentation protocol defined in <b>RFC 7383</b>
+The roadwarriors <b>carol</b> and <b>dave</b> set up an IPv4 connection each to
+gateway <b>moon</b> using the <b>IKEv1</b> and <b>IKEv2</b> key exchange protocol,
+respectively. The authentication is based on <b>X.509 certificates</b>. <b>dave</b>
+advertises the support of the IKEv2 fragmentation protocol defined in <b>RFC 7383</b>
which prevents the IP fragmentation of the IKEv2 messages carrying large X.509
certificates whereas <b>carol</b> announces support of non-standardized
IKEv1 fragmentation.