HP AA979A - StorageWorks SAN Switch 2/8V, Administrator'S Manual, Page: 400 / 465

406 Configuring and monitoring FCIP tunneling
Disabling FC Fastwrite on a port
To disable FC Fastwrite on a port, enter the following command.
#portcfg fastwrite <slot#/port_id> —disable
Where <slot#> is the slot in which the FR4-18i is installed. A slot number is not required for the 400 MP
Router.
Tunneling and IPSec
Internet Protocol security (IPSec) uses cryptographic security to ensure private, secure communications over
Internet Protocol networks. IPSec supports network-level data integrity, data confidentiality, data origin
authentication, and replay protection. It helps secure your SAN against network-based attacks from
untrusted computers, attacks that can result in the denial-of-service of applications, services, or the network,
data corruption, and data and user credential theft. By default, when creating an FCIP tunnel, IPSec is
disabled.
FCIP tunneling with IPSec enabled will support maximum throughput as follows:
• Unidirectional—approximately 104MB/sec
• Bidirectional—approximately 90MB/sec
Used to provide greater security in tunneling on an FR4-18i blade or a 400 MP Router, the IPSec feature
does not require you to configure separate security for each application that uses TCP/IP. When
configuring for IPSec, however, you must ensure that there is an FR4-18i blade or a 400 MP Router in each
end of the FCIP tunnel. IPSec works on FCIP tunnels with or without IP compression (IPComp).
IPSec requires an IPSec license in addition to the FCIP license.
IPSec uses some terms that you should be familiar with before beginning your configuration. These are
standardized terms, but are included here for your convenience.
Table 100 IPSec terminology
Term Definition
AES Advanced Encryption Standard. FIPS 197 endorses the Rijndael encryption
algorithm as the approved AES for use by US Government organizations and
others to protect sensitive information. It replaces DES as the encryption
standard.
AES-XCBC Cipher Block Chaining. A key-dependent one-way hash function (MAC) used
with AES in conjunction with the Cipher-Block-Chaining mode of operation,
suitable for securing messages of varying lengths, such as IP datagrams.
AH Authentication Header - like ESP, AH provides data integrity, data source
authentication, and protection against replay attacks but does not provide
confidentiality.
DES Data Encryption Standard is the older encryption algorithm that uses a 56-bit
key to encrypt blocks of 64-bit plain text. Because of the relatively shorter key
length, it is not a secured algorithm and no longer approved for Federal use.
3DES Triple DES is a more secure variant of DES, it uses 3 different 56-bit keys to
encrypt blocks of 64-bit plain text. The algorithm is FIPS-approved for use by
Federal agencies.
ESP Encapsulating Security Payload is the IPSec protocol that provides
confidentiality, data integrity and data source authentication of IP packets, and
protection against replay attacks.
MD5 Message Digest 5, like SHA-1, is a popular one-way hash function used for
authentication and data integrity.
SHA Secure Hash Algorithm, like MD5, is a popular one-way hash function used for
authentication and data integrity.