RFC 4806:Online Certificate Status Protocol (OCSP)...
RFC-Ref

In-Band


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... IKEv2 allows CRLs to be exchanged in-band via the CERT payload. ...
... bandwidth-limited environments (e.g., mobile communications). The net effect is exclusion of in-band CRLs in favor of out-of-band (OOB ...
... OCSP [RFC2560] offers a useful alternative. The size of an OCSP response is bounded and small and therefore suitable for in-band IKEv2 signaling ...
... IKEv2 that enables the use of OCSP for in-band signaling of certificate revocation status ...



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