Send a IKEv2 SA to an IP and wait for answers.

def ikev2scan(ip, **kwargs):
    """Send a IKEv2 SA to an IP and wait for answers."""
    return sr(IP(dst=ip) / UDP() / IKEv2(init_SPI=RandString(8),
                                         exch_type=34) / IKEv2_payload_SA(prop=IKEv2_payload_Proposal()), **kwargs)