User manual

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(iv) DNS Se r v e r
Primary DNS Server: Enter the IP address of the primary DNS server.
Secondary DNS Server: Enter the IP address of the secondary DNS server.
No te :
Please contact your ISP or network administrator for the IP address of the primary and the
secondary DNS servers. When the NAS plays the role as a terminal and needs to perform
independent connection, for example, BT download, you must enter at least one DNS server
IP for proper URL connection. Otherwise, the function may not work properly.
If you select to obtain the IP address by DHCP, there is no need to configure the primary and
the secondary DNS servers. In this case, enter ‘0.0.0.0’.
(v) Jumbo Frame Settings (MTU)
This feature is not supported by TS-509 Pro, TS-809 Pro, and TS-809U-RP.
‘Jumbo Frames’ refer to the Ethernet frames that are larger than 1500 bytes. It is designed to
enhance Ethernet networking throughput and reduce the CPU utilization of large file transfers by
enabling more efficient larger payloads per packet.
Maximum Transmission Unit (MTU) refers to the size (in bytes) of the largest packet that a given
layer of a communications protocol can transmit.
The NAS uses standard Ethernet frames: 1500 bytes by default. If your network appliances support
Jumbo Frame setting, select the appropriate MTU value for your network environment. The NAS
supports 4074, 7418, and 9000 bytes for MTU.
No te : The Jumbo Frame setting is valid in Gigabit network environment only. All the network
appliances connected must enable Jumbo Frame and use the same MTU value.