Polycom RealPresence 2000, Руководство администратора

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RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
23-54
Polycom, Inc.
System Flag:
ENABLE_SENDING_ICMP_DESTINATION_UNREACHABLE
This System Flag enables the administrator to control whether the RMX sends ICMP
Destination Unreachable Messages (ICMP message type #3 ) .
Destination Unreachable Messages are sent when the RMX receives a UDP packet on a port
configured for TCP, or receives a UDP packet on a port configured for TCP, or when, in real
time, a packet is not processed in the prescribed time interval. For detailed timestamp
information see RFC 792 .
The Destination Unreachable Message may also be sent when Network or Host is unreachable
(sent by the router) or the Port is unreachable (sent by the RMX).
• Range: YES / NO
• Default :
—
Ultra Secure Mode: NO - Destination Unreachable Message is never sent.
—
Default Security Mode: YES - Destination Unreachable Message is sent when needed.
Modifying the flag values
To modify the System Flags values, the flags must first be manually added to system.cfg .
For more information about System Flags , see “ Manually Adding and Deleting System Flags ” in
the Administrator’s Guide .
Password Encryption
In compliance with UC APL, FIPS 140-2 the SHA-256 ( Secure Hash Algorithm) is applied to:
• Application login passwords.
• Linux operating system passwords.
• CSRs (Certificate Signing Requests).
The output value for SHA-256 is 256 bits whereas for SHA-1 the output value is 160 bits.