VBrick Systems 7000 Series, Руководство администратора

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System Configuration
VBrick H.264 Appliance Admin Guide 9
Domain Name Server
Network Time Synchronization
These fields are used to synchronize network time using the host name or IP address of a
known server to provide a synchronized time for all appliances in the network.
Network Interface Type Half Duplex, Full-Duplex, or Automatic. This allows the
Ethernet interface of the VBrick to be manually forced to Half or
Full Duplex. The default setting is Automatic which enables auto
negotiation in the appliance so it will automatically match its
duplex setting to that of the switch or hub that it is attached to.
Automatic is the default and recommended setting.
The settings
for Network Interface Speed and Network Interface Type are
interdependent. See the description of Network Interface Speed
above.
Note: Half Duplex is only supported on encoder models with a
Hardware Revision
level of 2.1 or higher. To check revision level,
go to Monitor > System page.
Maximum Transmission
Unit Size Range 1024–1500 (default = 1500). The MTU is used for all
network traffic from the VBrick and defines the largest network
packet size that will be transmitted. A higher MTU brings higher
bandwidth efficiency and VBrick recommends using the default.
However you may wish to reduce MTU size to meet the
requirements of some networks with VPN or other security
tunnels that cannot tolerate 1500-byte packets.
Primary Server IP Address This is the primary server used for DNS.
Secondary Server IP Address This is the secondary server used for DNS.
Default Domain Extension This is the domain name used for DNS.
Note Network Administrators please note. DHCP Option 4 (TIME) and Option 42 (NTP)
are requested from the DHCP server to obtain SNTP server addresses. One or both
of these options must be enabled in the DHCP server for these addresses to be
returned to the VBrick. If both are returned, the VBrick will use the NTP server
address. If the DHCP server configuration is unknown, it is recommended that the
address(es) be manually entered since the DHCP server-supplied address will always
override a manually-entered address.
Network Time Protocol Check to enable network time synchronization. Default =
Disabled.
Primary Server IP Address Primary host name (VBrick Host Name or DNS Host
Name) or IP address of valid SNTP server providing time
synchronization. A blank field indicates the server address
will be acquired via the DHCP server only if the
Network
DHCP
field above is checked.