HP Fabric OS v7.0.1, Руководство администратора

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170 Fabric OS Administrator’s Guide
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Management interface security
7
IPsec policies
An IPsec policy determines the security services afforded to a packet and the treatment of a packet
in the network. An IPsec policy allows classifying IP packets into different traffic flows and specifies
the actions or transformations performed on IP packets on each of the traffic flows. The main
components of an IPsec policy are: IP packet filter and selector (IP address, protocol, and port
information) and transform set.
IPsec traffic selector
The traffic selector is a traffic filter that defines and identifies the traffic flow between two systems
that have IPsec protection. IP addresses, the direction of traffic flow (inbound, outbound) and the
upper layer protocol are used to define a filter for traffic (IP datagrams) that is protected using
IPsec.
IPsec transform
A transform set is a combination of IPsec protocols and cryptographic algorithms that are applied
on the packet after it is matched to a selector. The transform set specifies the IPsec protocol, IPsec
mode and action to be performed on the IP packet. It specifies the key management policy that is
needed for the IPsec connection and the encryption and authentication algorithms to be used in
security associations when IKE is used as the key management protocol.
IPsec can protect either the entire IP datagram or only the upper-layer protocols using tunnel mode
or transport mode . Tunnel mode uses the IPsec protocol to encapsulate the entire IP datagram.
Transport mode handles only the IP datagram payload.
IKE policies
When IKE is used as the key management protocol, IKE policy defines the parameters used in IKE
negotiations needed to establish IKE SA and parameters used in negotiations to establish IPsec
SAs. These include the authentication and encryption algorithms, and the primary authentication
method, such as preshared keys, or a certificate-based method, such as RSA signatures.
3des_cbc 168-bit ESP Triple DES is a more secure variant of DES. It uses three different
56-bit keys to encrypt blocks of 64-bit plain text. The algorithm is
FIPS-approved for use by Federal agencies.
blowfish_cbc 64-bit ESP Blowfish is a 32-bit to 448-bit keyed, symmetric block cipher.
aes128_cbc 128-bit ESP Advanced Encryption Standard is a 128- or 256-bit fixed block size
cipher.
aes256_cbc 256-bit ESP
null_enc n/a ESP A form of plaintext encryption.
TABLE 43 Algorithms and associated authentication policies (Continued)
Algorithm Encryption Level Policy Description