3Com 3C16120 - SuperStack 3 Server Load Balancer, Руководство по выпуску

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ELEASE NOTE INFORMATION
See the Server Load Balancer and Server Load Balancer Plus User Guide
for information.
Server Network
Address Translation
The Server Load Balancer and Server Load Balancer Plus allows for a
network address to be specified for translation when a server initiates a
connection to the external network. The intent of this feature is to allow
application servers to retrieve content from external locations of the
network that they are connected to.
This feature supports the following protocols:
The NAT feature does not meet the requirements of a full application
level gateway implementing network address translation. Additional
protocols may work correctly but any protocols that negotiate dynamic
ports do not work (i.e. RTSP, H323, SIP, etc.).
Dynamic Port
Range
If NAT is configured for operation on a Server Load Balancer and Server
Load Balancer Plus, the application services should not be defined using
port numbers that overlay the dynamic port range that includes ports
49152 through 57343. These port ranges are used by the NAT function
of the Server Load Balancer and Server Load Balancer Plus and potential
port collisions may affect the proper operation of the application service
or the address translation function.
Software Upgrades
The following section describes known issues related to performing
software upgrades.
TFTP Server Timeouts For the purpose of upgrading operational firmware, the TFTP protocol is
used by the Server Load Balancer and Server Load Balancer Plus to
connect to servers. The Server Load Balancer and Server Load Balancer
Plus makes multiple attempts to upgrade using the designated TFTP
server.
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DNS
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ICMP PING.
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FTP
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TELNET
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HTTP