QNAP TS-859 Pro+, User Manual, Page: 26 / 242

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iii. DNS Server
y
Primary DNS Server: Enter the IP address of the primary DNS server.
y
Secondary DNS Server: Enter the IP address of the secondary DNS server.
Note:
1. 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, e.g. BT download, you
must enter at least one DNS server IP for proper URL connection. Otherwise,
the function may not work properly.
2. If you select to obtain the IP address via DHCP, there is no need to configure the
primary and the secondary DNS servers. In this case, enter “0.0.0.0”.
iv. Jumbo Frame Settings (MTU)
“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.
Note: 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.