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Additional info for Oracle Enterprise Manager. Configuration Guide (Part No. A88769-01) (Release 9.0.1)
The DHCP message exchange is safeguarded and extended. CLL protects DHCP not only from unauthorized attackers, but also from malicious behavior originating from authenticated hosts. In case DHCP is used, the local CA issues a base certificate for each host, bearing only the machine’s MAC address and no IP address. The DHCP server uses the base certiﬁcate as a template to generate a full-ﬂedged host certiﬁcate, which contains the assigned IP address. Thus, it acts as a second CA. The host certiﬁcate issued by the DHCP server has the same validity period as the IP address lease.
Invalid packets are dropped. Then it must be checked whether the sender’s IP/MAC address pair claimed in the ARP request (and its MAC address stated in the Ethernet header) matches the one speciﬁed in its certiﬁcate. If the handshake packet turns out to be valid, CLL creates a new SA with the requesting host, based on the local and the received cryptographic parameters. Finally, CLL strips oﬀ everything from the handshake packet except for the ARP header, restores the ARP EtherType number in the Ethernet header and passes the resulting ordinary ARP request up the protocol stack to the ARP module.
However, as long as this is not the case, host B may not transmit any IP packets to its peer—A might not be able to authenticate them. Instead, in the unlikely case that B wants to transmit to A before A has sent the ﬁrst packet, B must queue its IP datagram and send a new handshake request to A. This enforces the creation of a new SA, replacing the existing incomplete one. Safeguarding against Replay Attacks. While the initiator of the SA protects itself against a replayed handshake reply with the aid of a nonce, its peer has to rely on the timestamp check when judging the freshness of an incoming handshake request.
Oracle Enterprise Manager. Configuration Guide (Part No. A88769-01) (Release 9.0.1)