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Configurable Options Anchor |
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The network protocol can be configured in ways that affect compression, encryption, code pages, and network delays.
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The following configuration options are available on many Universal Agent components:
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CODE_PAGE Anchor |
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The CODE_PAGE option specifies the code page translation table used to translate network data from and to the local code page for the system on which the program is executing.
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A codepage table is text file that contain a two-column table. The table maps local single byte character codes to two-byte UNICODE character codes.
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Code pages are located in the product National Language Support (NLS) directory or library. New code pages may be created and added to the NLS directory or library. The CODE_PAGE option value is simply the name of the code page file without any file name extension if present.
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CTL_SSL_CIPHER_LIST
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The CTL_SSL_CIPHER_LIST option specifies one or more SSL/TLS cipher suites that are acceptable to use for network communications on the control session, which is used for component internal communication.
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The SSL/TLS protocol uses cipher suites to specify the combination of encryption and message digest algorithms used for a session. An ordered list of acceptable cipher suites can be specified in a most-to-least order of preference.
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An example cipher suite list is RC4-MD5,RC4-SHA,AES128-SHA. The RC4-MD5 cipher suite is the most preferred and AES128-SHA is the least preferred.
When two Universal Agent components (Manager and a Server) first connect, they perform an SSL/TLS handshake that negotiates the cipher suite to use for the session. The Manager presents a list of cipher suites (in descending order of preference) that it would like to use. This is compared against a list of ciphers that the Server supports. The first cipher suite in common is the one used for the session.
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DATA_AUTHENTICATION The DATA_AUTHENTICATION option specifies whether or not the network data is authenticated. Data authentication verifies that the data did not change from the point it was sent to the point it was received.
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The DATA_SSL_CIPHER LIST option specifies one or more SSL/TLS cipher suites that are acceptable to use for network communications on the data session, which is used for standard I/O file transmission.
(See
Network Data Transmission Configurable Options#CTL CTL_SSL_CIPHER_LIST.)
DEFAULT_CIPHER
The DEFAULT_CIPHER option specifies the SSL cipher suite to use (since SSL protocol requires a cipher suite) if the
Network Data Transmission Configurable Options#DATA DATA_ENCRYPTION option is set to
no. The default DEFAULT_CIPHER is NULL-MD5 (no encryption, MD5 message digest).
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A keepalive message is sent from the server to the manager. If the server does not receive a keepalive acknowledgement from the manager in a certain period of time (calculated as the maximum of 2 x
Network Data Transmission Configurable Options#NETWORK NETWORK_DELAY or the KEEPALIVE_INTERVAL), the server considers the manager or network as unusable.
How the server processes a keepalive time-out depends on what fault tolerant features are being used. If no fault tolerant features are being used, the server ends with an error. The manager expects to receive a keepalive message in a certain period of time (calculated as the KEEPALIVE_INTERVAL + 2 x
Network Data Transmission Configurable Options#NETWORK NETWORK_DELAY.
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NETWORK_DELAY
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